Session and scheduling information are listed below. Select a session from the list and press "Go" to view the abstracts for that session.
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Session
13
: OLED Fingerprint Sensing Displays |
Sensors Integration and Multi-Functional Displays
; Interactive Displays and Systems
; OLEDs
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Tuesday, May 14 / 02:00 PM - 3:20 PM / San Jose Convention Center, LL21CD
Chair:
Martin Grunthaner, Apple, Cupertino, CA US
Co-Chair:
Nicholas Thompson, Universal Display Corporation, Ewing, NJ USA
13.1 - Invited Paper: New Frontier in Display Technology: OPD Sensor in OLEDs for Healthcare Application (2:00 PM - 2:20 PM)
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Sunghan Kim, Seokgyu Yoon, Jinsoo Jung, Min-Soo Choi, Chul Kim
Samsung Display Co., Ltd. Yongin South Korea
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Red light can be used for organic photodetectors (OPDs) in an all-in-one sensor display. Red pixels are used as the light source and an OPD capable of effective detection of 625 nm light is demonstrated with an EQE of 25%. These results show that OLED panels can be used for fingerprint recognition and as a health care platform.
13.2 - Organic Light-Emitting Diode Display Constitutes Side-by-Side OLED and Organic Photodiode Pixels Integrated in the Same Plane by Adopting Metal Mask-Less Lithography (MML) Technology (2:20 PM - 2:40 PM)
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Kazuya Sugimoto, Ryo Hatsumi, Taisuke Kamada, Daisuke Kubota, Kenichi Okazaki, Sachiko Yamagata, Shunpei Yamazaki
Semiconductor Energy Laboratory Co., Ltd. Kanagawa Japan
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Yasutaka Nakazawa, Satoru Idojiri
Semiconductor Energy Laboratory Co., Ltd. Tochigi Japan
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This study presents the fabrication of a 513ppi organic light-emitting diode (OLED) display featuring an integrated organic photodiode (OPD) within each pixel, eliminating the need for a fine metal mask. The fabrication process involves photolithography for the side-by-side patterning of OLED and OPD subpixels, leading to a four-subpixel configuration.
13.3 - Full-Screen Fingerprint Display with Embedded Organic Photo-Detectors (2:40 PM - 3:00 PM)
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Kwang Soo Bae, Gun Hee Kim, Hyang A Park, Jungwoo Park, Taekyung Ahn, Dae-Young Lee, Seunghyun Moon, Jae-Kyoung Kim, Chul Kim, Yongjo Kim
Samsung Display Yongin South Korea
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This paper introduces a fully integrated in-cell fingerprint sensor display. An organic photo-detector (OPD) is embedded into a flexible OLED display plane to enable fingerprint sensing across the entire display active area while maintaining high display quality. No increased thickness or process cost is expected due to the efficient integration method.
13.4 - OLED/Organic Photodetector Dual-Mode Device Integrated into Side-by-Side Patterned OLED Display (3:00 PM - 3:20 PM)
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Taisuke Kamada, Yasuhiro Niikura, Ryo Hatsumi, Anna Oishi, Kazunori Watanabe, Kazuya Sugimoto, Daisuke Kubota, Sachiko Yamagata, Shunpei Yamazaki
Semiconductor Energy Laboratory Co., Ltd. Kanagawa Japan
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The authors develop a new OLED/organic photodetector dual-mode device that enables OLED subpixels to capture the image of an object on a screen. The proposed device can be integrated into an OLED display without changing the aperture ratio and pixel density of the display.
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Session
21
: OLED Physics |
OLEDs
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Tuesday, May 14 / 03:40 PM - 5:00 PM / San Jose Convention Center, LL21CD
Chair:
Nicholas Thompson, Universal Display Corporation, Ewing, NJ USA
Co-Chair:
Anna Hayer, Merck KGaA, Darmstadt, Germany
21.1 - Invited Paper: Analysis of Capacitance Characteristics of Highly Efficient Blue OLEDs by Impedance Spectroscopy (3:40 PM - 4:00 PM)
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Hyosup Shin, Moran Ha, Sung-Soo Bae, Changwoong Chu
Samsung Display Corporation Yongin South Korea
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Makoto Yamamoto
Samsung Electronics Yokohama Japan
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This paper focuses on devices with phosphor-sensitized TADF emission where analyzed by impedance spectroscopy. The capacitance is largely affected by the giant surface potential (GSP) of the layers. The influence of GSP on capacitance is from the GSP value and the position of the GSP layers in the device. The authors explain the mechanism based on simulation.
21.2 - Modulus Spectroscopy and Capacitance-Voltage Measurement of OLEDs as Tools for Estimating Charge Dynamics (4:00 PM - 4:20 PM)
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Ji Nan, Yupei Zhang, Zhi Huang, Long Chen, Bong-Geum Lee
Tianma Microelectronics Co., Ltd. Shanghai China
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Using hole-only and electron-only devices (HODs and EODs) cannot fully explain the dynamic characteristics of OLEDs such as charge accumulation and recombination. In this study, the well-established techniques of modulus spectroscopy and capacitance-voltage measurement are combined and applied to describe the carrier dynamics in multilayer OLED devices at high temperature.
21.3 - Closed-Form Expression for the Current-Voltage Characteristics of OLEDs (4:20 PM - 4:40 PM)
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Khaled Ahmed
Intel Corporation Santa Clara CA US
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A new data-validated closed-form physics-based expression is derived for the I-V characteristics of OLEDs. Two parameters emerge from the new model: liminal current and liminal voltage. Both parameters are expressed in terms of device and material parameters. Robust parameter extraction methods are proposed and validated with experimental data.
21.4 - Understanding Bottom-Emission Blue OLED Efficiency, Lifetime Trends, and Capacitance Curves with Different EILs (4:40 PM - 5:00 PM)
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Wenbin Jia, Xiaoning Liu, Feng Li, Xiang Wan, Li Sun, Kaihong Ma, Minghong Xu, Juanjuan You, Huai-Ting Shih, Jianwei Yu
Hefei BOE Joint Technology Co., Ltd. Anhui China
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Kening Zheng
Chengdu BOE Technology Group Co., Ltd. Chengdu China
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The effects of different electron injection layers (NaF/LiF/Liq/ETL:Li) on electrical properties, lifetime, and capacitance are systematically explored on bottom-emission blue OLEDs. The authors can determine the aging speed and initial decay of the OLED device from the characteristics of the capacitance.
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Session
29
: OLED Devices I |
OLEDs
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Wednesday, May 15 / 09:00 AM - 10:20 AM / San Jose Convention Center, LL21CD
Chair:
Jang Hyuk Kwon, Kyung Hee University, Seoul, South Korea
Co-Chair:
Denis Kondakov, DuPont, Wilmington, DE US
29.1 - Invited Paper: Spin-Orbital Coupling Enhancement and Exciton Manipulation Targeting Narrowband and Highly Stable OLEDs (9:00 AM - 9:20 AM)
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Xun Tang, Chihaya Adachi
Kyushu University Fukuoka Japan
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Enhancing the spin-orbital coupling of multiple-resonance (MR) emitters and manipulating excitons is critical to improving OLED stability. In this work, MR emitters with an accelerated reverse intersystem crossing rate are designed. In addition, the charge carrier and exciton behaviors in such MR emitter devices are investigated, resulting in exceeding 400 hours (LT95) lifetime at 1,000 nits.
29.2 - Distinguished Paper: High Efficiency and High Color Purity Deep-Blue Organic Light-Emitting Diodes with Blue Index >500 (9:20 AM - 9:40 AM)
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Wei Gao, Jianyun Wang, Yepeng Xiang, Jinghua Niu, Long Chen, Bong-Geum Lee
Tianma Microelectronics Co., Ltd. Shanghai China
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The authors report effective phosphor-sensitized fluorescent (PSF) OLED devices. Their PSF OLED exhibits a maximum external quantum efficiency (EQE) of 53.8% with CIEy of 0.060 and a blue index (BI) of 508 cd/A/CIEy, which is the highest efficiency result reported for PSF deep-blue OLEDs.
29.3 - Improving Lateral Leakage Current in OLED Pixels by New Hole-Transport Materials: Resolving the Crosstalk Issue (9:40 AM - 10:00 AM)
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You-Hyun Kim, Leo Weegels, Christian Eickhoff, Falk May, Jens Engelhart, Sebastian Meyer, Joachim Kaiser
Merck KGaA Darmstadt Germany
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Michele Ricks
EMD Electronics Philadelphia PA US
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The current flows in the lateral direction from active blue pixel to neighboring non-active red/green sub-pixels cause undesired emissions. In this paper the authors report recently developed hole-transport materials (HTMs) that significantly suppress such lateral leakage currents.
29.4 - TOF SIMS for OLED Film 3D Detection and Real-Time Failure Analysis (10:00 AM - 10:20 AM)
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Kening Zheng, Bo Shi, Long Chen, Li Zhu, Langtao Li, Dengyu Wang, Xuenan Pan, Kai Zhang, Dongfang Yang, Guoqiang Tang, Fujiang Jin
Chengdu BOE Optoelectroncs Technology Co., Ltd. Chengdu China
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Qiang Fu
BOE Technology Group Co., Ltd. Beijing China
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Dongyu Gao
Chongqing BOE Display Technology Co., Ltd. Chongqing China
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By analyzing OLED film layers using the TOF SIMS method with 3D imaging capability, the authors can effectively improve the detection of OLED defects and understand the constitutive relationship. This inspection method can be integrated into the production line to realize process improvement and defect interception during mass production.
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Session
34
: Healthcare and Biomedical Sensing Applications |
Sensors Integration and Multi-Functional Displays
; Emerging Technologies and Applications
; OLEDs
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Wednesday, May 15 / 09:00 AM - 10:20 AM / San Jose Convention Center, LL21AB
Chair:
Ying Zheng, Microsoft, Redmond, WA USA
Co-Chair:
Susan Jones, Nulumina Corp., Georgetown, TX US
34.1 - Invited Paper: High-Throughput TFT Technology for In-Situ DNA Synthesis and Signal Sensing (9:00 AM - 9:20 AM)
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Jun Li, Xiaojun Guo
Shanghai Jiao Tong University Shanghai China
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Zhe Liu, Ye Xiao, Suman Huo, Fan Wu, Linrun Feng, Yixing Yang
Hangzhou LinkZill Technology Co., Ltd. Hangzhou China
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Thin-film transistor (TFT) technology can be an innovative way for the electrochemically controlled synthesis of short DNA or RNA sequences, including oligonucleotides. Applying traditional DNA synthesis to TFT arrays produces high-quality oligonucleotide sequences over 150 nucleotides. These methods offer high-throughput, high-accuracy, and low-cost advantages compared to prevalent CMOS-based synthesis.
34.2 - Deformable OLEDs: From Design to Applications (9:20 AM - 9:40 AM)
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Seunghyup Yoo, Jee Hoon Sim, Junho Kim, Hyeonwook Chae, Donggyun Lee, Su-Bon Kim
KAIST Daejeon South Korea
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The authors introduce a few novel design strategies to realize efficient deformable OLEDs, including stretchable and ultrathin OLEDs. 3D structures are proposed for stretchable OLEDs with unprecedented rigid-island density and high maximum strain. Ultrathin OLEDs are used to create cylindrical light sources applicable to internal photo biomodulation for inner-body phototherapeutics.
34.3 - Sensing and Biomimetic Stimulation of Cardiomyocyte Cell Culture with a Thin-Film-Transistor Active-Matrix Platform (9:40 AM - 10:00 AM)
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Agnès Tixier-Mita, Xingzhuo Hu, Thomas Menier, Pierre-Marie Faure, Timothée Lévi, Hiroshi Toshiyoshi
The University of Tokyo Tokyo Japan
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Satoshi Ihida, Tomoko Teranishi
Sharp Corporation Tenri Japan
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A thin-film-transistor (TFT)-based sensing/stimulation platform is used as a model for studying brain-heart interactions. This work demonstrates the possibility not only to perform sensing but also stimulation of cardiomyocyte cells cultured on active-matrix TFT platforms. This platform shows the possibility of multimodality over a large sensing area with high spatial resolution compared to standard devices fabricated with CMOS or MEMS technology.
34.4 - A 270fps Large-Area Organic Optical Biosensor Array for Digital Physiology and Vein Biometrics (10:00 AM - 10:20 AM)
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Chung-Kai Chen, Xingle Wang, Adithya Naresh, Naoki Takada
JDI Display America, Inc. San Jose CA US
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Gen Koide, Takashi Nakamura
Japan Display Inc. Mobara Japan
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Toshinori Uehara
Japan Display Inc. Ebina Japan
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Dongkai Cheng, Yusaku Tagawa, Tomoyuki Yokota, Takao Someya
The University of Tokyo Tokyo Japan
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The authors develop an optical biosensor system including a thin-film transistor sensor array and silicon IC for capturing vein images and photoplethysmography (PPG) signals but also generating blood perfusion images, which are useful in several medical applications. This system can be a low-cost replacement for the current blood perfusion imaging methods with low supply voltages, making it a good candidate for battery-powered applications.
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Session
37
: OLED Devices II |
OLEDs
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Wednesday, May 15 / 10:40 AM - 12:00 PM / San Jose Convention Center, LL21CD
Chair:
Yifan Zhang, Apple, Inc., Cupertino, CA US
Co-Chair:
Changwoong Chu, Samsung Display Company, Yongin, South Korea
37.1 - Invited Paper: Efficient Single-Layer Blue-Emitting OLEDs (10:40 AM - 11:00 AM)
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Oskar Sachnik, Xiao Tan, Paul Blom, Gert-Jan Wetzelaer
Max Planck Institute for Polymer Research Mainz Germany
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For single-layer OLEDs to achieve efficiencies approaching those of multilayer devices, balanced charge transport is a prerequisite. The authors demonstrate a single-layer blue-emitting OLED with unity internal quantum efficiency and an external quantum efficiency of 27.7% with minor roll-off at high brightness. These findings lay the foundations for efficient solution-processed OLEDs.
37.2 - Impact of Thermal Factors on Carrier Density in OLED under Low-Voltage Condition (11:00 AM - 11:20 AM)
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Sang Ho Jeon, Jungmin Moon, Jeongsu Park, Yo Seoph Ko, Donghoon Kim
Samsung Display Co., Ltd. Gyunggi South Korea
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This study investigates why current density in OLEDs unexpectedly rises with temperature at low voltages. The authors develop a predictive equation and show that current injection into the emission layer can be pre-evaluated using TEG device measurements. Their findings offer a framework for evaluating OLED performance and understanding temperature sensitivity.
37.3 - Donor-Acceptor Alignment and Charge Separation in Small-Molecule Organic Semiconductors (11:20 AM - 11:40 AM)
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Artem Fediai, Tobias Neumann, Franz Symalla, Timo Strunk
Nanomatch GmbH Karlsruhe Germany
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This study uses simulation tools to explore how molecular properties, particularly Coulomb interactions, affect charge transfer in OLED materials. It highlights the impact of molecular packing and microelectrostatic environments on charge transfer binding energy. These findings, challenging to acquire experimentally, are crucial for designing high-performance organic compounds and improving OLED efficiency.
37.4 - Degradation Analysis on Li-doped Organic Charge-Generation Layer (11:40 AM - 12:00 PM)
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Ki Ju Kim, Dohyeon Yoo
Hongik University Seoul South Korea
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Taekyung Kim
Hongik University Sejong South Korea
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This study investigates how thermal and electrical stresses affect the performance of the Li-doped charge-generation layer (CGL) in tandem devices. Using various measurements, the study reveals that thermal stress impacts more significantly. Degradation in electrical properties is linked to Li diffusion, confirmed by XPS depth profiling.
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Session
45
: OLED Materials I |
OLEDs
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Wednesday, May 15 / 03:30 PM - 5:10 PM / San Jose Convention Center, LL21CD
Chair:
Yasunori Kijima, Huawei Technologies Japan K.K., Shinagawa, Japan
Co-Chair:
Anna Hayer, Merck KGaA, Darmstadt, Germany
45.1 - Invited Paper: Design Strategies for NIR-Emitting Materials (3:30 PM - 3:50 PM)
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Jeong Yong Park, Gyeong Seok Lee, Yun-Hi Kim
Gyeongsang National University and Research Institute of Molecular Alchemy Jinju South Korea
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In this paper, the authors summarize a collection of innovative organic near-infrared (NIR) emitters that are a crucial factor to design a specific NIR emitter for NIR OLEDs. Near-infrared organic light-emitting diodes (NIR OLEDs) with heavy metals or TADF materials are regularly reported due to the advantages of their various applications in healthcare services, authentication, and night vision displays.
45.2 - Invited Paper: Emitter Based on Europium as Alternative for Stable, Deep-Blue OLED Emission (3:50 PM - 4:10 PM)
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Carsten Rothe, Paulius Imbrasas, Volodymyr Senkovskyy, Jan Blochwitz-Nimoth
beeOLED GmbH Dresden Germany
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Efficient and stable blue is the holy grail of OLED. beeOLED is pioneering an intra-metallic Europium emitter that offers a unique combination of deep-blue, single-peak emission spectrum, open-shell electronic configuration for 100% efficiency, and the potential of high operational stability, as no organic bonds are weakened during light generation.
45.3 - Molecular Design of Blue Phosphorescent Platinum Complexes for Highly Efficient, Long-Lived Blue Organic Light-Emitting Diodes (4:10 PM - 4:30 PM)
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Tomoya Yamaguchi, Tomohiro Kubota, Hideko Inoue, Hiromitsu Kido, Nobuharu Ohsawa, Satoshi Seo, Shunpei Yamazaki
Semiconductor Energy Laboratory Co., Ltd. Kanagawa Japan
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The authors' novel blue phosphorescent platinum complexes (BD-01 and BD-02) achieve high quantum yield and orientation. A BD-02 organic light-emitting diode (OLED) achieves an external quantum efficiency of 28.6% due to its inhibited interaction with a host molecule. This improved efficiency reduces the driving current of OLEDs and increases their lifetime.
45.4 - On the Determination of Ionization Potentials (4:30 PM - 4:50 PM)
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Franz Symalla, Artem Fediai, Tobias Neumann, Timo Strunk
Nanomatch GmbH Karlsruhe Germany
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Two key material properties in the design of balanced OLED devices are ionization potential (IP) and electron affinities (EA). The authors discuss how measured quantities relate to relevant energy levels in OLEDs. They present a simulation approach and benchmark it against experimental data. The derived understanding has the potential to improve material alignment in OLED devices, ultimately improving efficiency.
45.5 Late-News Paper: Green Phosphor-Sensitized Multiple Resonance OLEDs with Current Efficiency of More than 250 cd/A (4:50 PM - 5:10 PM)
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Xiao Liang, Xudong Cao, Chong Li
Jiangsu Sunera Technology Wuxi China
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Dongdong Zhang, Lian Duan
Tsinghua University Peking China
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An advanced organic light-emitting diode (OLED) architecture featuring a green phosphorescent emitter with multiple resonance sensitization achieves a notable current efficiency exceeding 250 cd/A at a density of 10 mA/cm2. This design integrates phosphor-sensitized fluorescent technology, resulting in significant longevity enhancement, superior color accuracy, and reduced sensitivity to doping concentrations.
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Session
53
: OLED Materials II |
OLEDs
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Thursday, May 16 / 09:00 AM - 10:20 AM / San Jose Convention Center, LL21CD
Chair:
Sven Zimmermann, Novaled GmbH, Dresden, Germany
Co-Chair:
Toshiaki Ikuta, SK materials JNC, Hwaseon-si, South Korea
53.1 - Invited Paper: Deuteration of OLED Materials: Impact on Device Performance and Commercial Manufacturing (9:00 AM - 9:20 AM)
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Elvira Montenegro, Stephanie Ganss, Marcel Bürger , Camille Correia, Aaron Lackner, Sebastian Stolz, Jonas Kröber, Anna Hayer, Jens Engelhart, Rouven Linge
Merck KGaA Darmstadt Germany
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Won-Kyung Na, Su-Hwan Na
Merck Performance Materials Ltd. Pyeongtaek South Korea
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The authors intensively investigate the impact of deuteration degree and pattern on device performance. To meet the increasing demand of deuterated electronic materials, scale-up processes, enabling high purity and cost-efficient manufacture of deuterated OLEDs, are developed. This presentation will discuss various aspects of the deuteration of OLED materials.
53.2 - Invited Paper: Highly Efficient and Pure-Blue Organic Light-Emitting Diodes Using Boron-Free Emitters (9:20 AM - 9:40 AM)
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Jihoon Kang, Jun Yeob Lee
Sungkyunkwan University Suwon South Korea
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Ha Lim Lee
Sungkyunkwan University & Samsung Electronics Co., Ltd. Suwon South Korea
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Soon Ok Jeon
Samsung Electronics Co., Ltd. Suwon South Korea
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A new class of materials is designed and synthesized as deep-blue organic emitters. Only carbon and nitrogen are used with the materials to induce the multi-resonance effect in the emitters. A deep-blue color, a narrow emission spectrum, and high efficiency by thermally activated delayed fluorescence are achieved.
53.3 - Distinguished Student Paper: Developing Pure-Green Polycyclo-Heteraborin MR-TADF Scaffolds for Efficient, Stable Narrowband OLEDs (9:40 AM - 10:00 AM)
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Paramasivam Palanisamy, Odugu Kumar, Hae Ung Kim, Jang Hyuk Kwon
Kyung Hee University Seoul South Korea
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The authors developed two symmetrical green MR-TADF emitters, BpIC-DPA and BpIC-Cz, based on the rigidification and regulation of molecular orbitals (MOs) engineering strategies. Both emitters exhibited pure-green emission with narrow FWHM below 25 nm and a high PLQY of 84%. The BpIC-Cz device showed maximum external quantum efficiency of 25.7%.
53.4 - Boosting the Performance of Phosphor-Assisted Fluorescence Devices by Fine-Tuning the Peripheral Groups of Multi-Resonance Fluorescent Dopants (10:00 AM - 10:20 AM)
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Minghan Cai, Guomeng Li, Baoyu Li, Hongyu Wang, Genmao Huang, Xiujian Zhu, Wonjun Song
Visionox Technology Inc. Beijing China
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Yuewei Zhang, Dongdong Zhang, Lian Duan
Tsinghua University Beijing China
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In this article, the authors demonstrate that, by appropriately introducing inert substituents at the periphery of multi-resonance fluorescent dye, charge trapping introduced by fluorescent dyes can be significantly inhibited in phosphor-assisted fluorescence devices, and the energy transfer from assisted phosphors to fluorescent dyes can also be more efficient.
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Session
61
: OLED Novel Devices and Analysis |
OLEDs
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Thursday, May 16 / 10:40 AM - 11:40 AM / San Jose Convention Center, LL21CD
Chair:
Franky So, North Carolina State University, Raleigh, NC US
Co-Chair:
Chihaya Adachi, Kyushu University, Fukuoka, Japan
61.1 - Invited Paper: Polaritonic OLEDs with Assistant Strong-Coupling Layers: A New Approach to Sub-20nm Emission Linewidth in OLED Displays (10:40 AM - 11:00 AM)
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Andreas Mischok, Sabina Hillebrandt, Seonil Kwon
University of Cologne Cologne Germany
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Malte Gather
University of Cologne & University of St Andrews Cologne Germany
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To reach narrowband emission without spectrum change with observation angle, the authors hybridize microcavity photons and excitons in an efficient OLED, called polaritonic OLED. They use assistant strong-coupling layers located away from the recombination zone results in an efficient OLED with FWHM < 20nm and shift of < 10nm at 60° observation angle.
61.2 - Invited Paper: Light-Emitting Diodes Based on Metal-Halide Perovskites and Beyond (11:00 AM - 11:20 AM)
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Biwu Ma
Florida State University Tallahassee FL US
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Despite recent rapid development, LEDs have not achieved their full potential in terms of performance and cost efficiency. Recently, metal-halide perovskites and perovskite-related hybrids have emerged as new-generation luminescent materials with unique optoelectronic properties. Here, the recent development of LEDs based on metal-halide perovskites and beyond will be discussed.
61.3 - Distinguished Paper: Realization of an Organic Semiconductor Electroluminescent Device with High Directionality and Color Purity (11:20 AM - 11:40 AM)
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M. Auffray, A. Mikaeili, A. Mohammed, T. Fukuta, T. Yoshizumi, H. Ishidai, K. Tsukiji, Y. Fukunaga, F. Bencheikh
KOALA Tech Inc. Fukuoka Japan
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An organic electroluminescence device with high directionality (divergent angle 1.1°) and high color purity (FWHM of 2.5 nm) is introduced. This achievement is realized through recombination zone control and optical modes management. This work marks the world's first demonstration of an organic device with narrow FWHM and excellent directionality.
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Session
69
: OLED Displays I |
OLEDs
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Thursday, May 16 / 01:30 PM - 2:50 PM / San Jose Convention Center, LL21CD
Chair:
DZ Peng, Tianma, Chino, CA USA
Co-Chair:
CC Lee, Visionox, Hefei, China
69.1 - Invited Paper: Recent Progress in High-Performance AMOLED Display with ViP Technology (1:30 PM - 1:50 PM)
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Yiming Xiao, Zhendong Ding, Zhengkui Dong, Zengqiang Xia, Yuan Yao, Bowen Yang, Zhao Zu, Haohan Zhang, Yongqiang Du, Yuting Fu, Liusong Ni, Murong Xue, Xuejing Zhu, Yiyou Lai, CC Lee
Hefei Visionox Technology Co., Ltd. Hefei China
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Xiujian Zhu, Zhaoji Peng, Deqiang Zhang
Visionox Technology Inc. Kunshan China
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Visionox intelligent pixelization (ViP) technology is a novel RGB self-aligned pixelization approach without fine-metal mask for OLED patterning. Since the technology was released in May 2023, numerous breakthroughs have been achieved. In this presentation, the recent results on panel performance and other advantages of ViP technology are discussed.
69.2 - A Novel Ultra-Large OLED Display Based on Small OLEDs (1:50 PM - 2:10 PM)
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Weifeng Zhou, Xiangfei He, Yunpeng Zhang, LiQiang Chen, Bo Shi, Ling Shi, Tao Gao, Yangzhong Jing, Jingli Yang
Chengdu BOE Optoelectronics Group Co., Ltd. Chengdu China
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The authors present a novel ultra-large OLED display with an extremely narrow bezel, parallel driving of OLED, and two-time optical compensation. Using these technologies, they design an OLED with many units of small OLED displays, and the uniformity of brightness is more than 95%. Finally, they successfully develop an 8K OLED display up to 256 inches in size.
69.3 - A 6,000-nit Ultra-High Brightness and Wide BT.2020 Color Gamut Wearable Tandem OLED Display (2:10 PM - 2:30 PM)
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Lei Zhang, Hao Xue, Mingxi Tang, Pei Liu, Holy Yang, Carl Tsou
Everdisplay Optronics Corporation Shanghai China
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In this study, a wearable 1.64-in. panel with 3-stack RGB tandem OLED device is fabricated, which combines ultra-high brightness of 6,000 nits and 97.4% BT.2020 color gamut. As the panel is composed of a 3-stack tandem OLED structure, it also gains a longer display lifetime from these results.
69.4 - Distinguished Paper: High-Luminance and Highly Reliable Tandem OLED Display Including New Intermediate Connector Designed for Photolithography Applications (2:30 PM - 2:50 PM)
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Shinya Fukuzaki, Toshiki Sasaki, Hiromi Nowatari, Yuko Oe, Yui Yamada, Nobuharu Ohsawa, Shunpei Yamazaki
Semiconductor Energy Laboratory Co., Ltd. Kanagawa Japan
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The authors develop a new intermediate connector designed for photolithography applications by improving its resistance to water and atmospheric elements. With this new intermediate connector, they succeed in fabricating a high-luminance and highly reliable tandem organic light-emitting diode (OLED) by a side-by-side pixel-patterning method involving organic layer etching via photolithography.
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Session
77
: OLED Displays II |
OLEDs
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Thursday, May 16 / 03:10 PM - 4:30 PM / San Jose Convention Center, LL21CD
Chair:
Yuan-Chun Wu, China Star Optoelectronics, Shenzhen, China
Co-Chair:
Sangmoo Choi, Google LLC, Palo Alto, CA
77.1 - Invited Paper: Toward Commercialization of Vertical, Organic, Light-Emitting Transistors for Active-Matrix Displays (3:10 PM - 3:30 PM)
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Maxime Lemaitre, Svetlana Vasilyeva, Xiao Chen, Bo Liu
Mattrix Technologies Gainesville FL US
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VOLETs combine three of the four essential components of an AMOLED pixel — the drive transistor, the storage capacitor, and the OLED stack — into a single, highly stable, self-emissive structure. VOLETs can be manufactured on a-Si TFT backplanes to enable low-cost AMOLED displays with improved brightness and lifetime characteristics.
77.2 - Research on Suppressing the Electrical Crosstalk of Tandem OLED Sub-Pixels (3:30 PM - 3:50 PM)
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Danyang Jiang, Bo Jiang, Mengzhen Li, Jia Liu, Teng Cui, Liwei Ding, Cuili Gai
Yungu (Gu'an) Technology Co., Ltd. Guan China
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In a tandem OLED device, the common layer, including the charge-generation layer, will not only transport charge carriers vertically, but also transport the charge horizontally to adjacent sub-pixels, resulting in electrical crosstalk. The authors provide theoretical simulation and solutions to suppress the electrical crosstalk and optimize uniformity of the tandem OLED display.
77.3 - Power-Efficient and High-Color-Gamut RGBY AMOLED Displays (3:50 PM - 4:10 PM)
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Woo-Young So, Mike Hack, Eric Margulies, Michael Weaver, Julie Brown
Universal Display Corporation Ewing NJ US
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The authors present a novel four-color sub-pixel AMOLED display that uses only three OLED depositions while enabling very high color gamut with greatly reduced power consumption. Achieving 90% of Rec. 2020 color standard, power consumption is reduced by 39% compared to that of a conventional RGB side-by-side pixel architecture.
77.4 - Highly Efficient Side-by-Side Three-Stack Tandem Flexible OLED Displays with Yb-Doped n-CGLs (4:10 PM - 4:30 PM)
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Yuto Tsukamoto, Masakazu Shibasaki, Shota Nomiyama, Tokiyoshi Umeda, Shinichi Kawato
Sharp Display Technology Corporation Nara Japan
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The researchers have succeeded in developing highly efficient side-by-side three-stack tandem flexible OLED displays with Yb-doped n-CGLs, whose current efficiencies are up to 2.2 times as high as those of single OLED ones. These three-stack tandem OLED displays show 1,800 nits in full white with a polarizer.
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Session
85
: AI/ML for OLEDs |
OLEDs
; Artificial Intelligence Including Machine Learning for Imaging
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Friday, May 17 / 09:00 AM - 10:20 AM / San Jose Convention Center, LL21CD
Chair:
Eunkyung Koh, Samsung Display Research Center, Yongin, South Korea
Co-Chair:
Yifan Zhang, Apple, Inc., Cupertino, CA US
85.1 - Invited Paper: A Novel OLED Material Discovery Based on AI Technology (9:00 AM - 9:20 AM)
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Hoilim Kim, Seran Kim, Dongsun Yoo, Gyeonghun Kim, Eunkyung Koh, Jihye Kim, Saerom Park, Sohae Kim, Hyosup Shin, Hyunguk Cho, Seungin Baek
Samsung Display Gyeonggi-do South Korea
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A novel OLED material discovery process based on AI technology is reported. Six AI modules generate molecular structures using an active learning algorithm and predict multiple properties, novelty, synthetic scheme, relative synthesizability, and device characteristics. Some evaluation results are introduced to confirm the improvement.
85.2 - Prediction of Triplet Harvesting Ability in Blue Fluorescent Organic Light-Emitting Diodes Using Deep Learning (9:20 AM - 9:40 AM)
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Junseop Lim, Jun Yeob Lee
Sungkyunkwan University Suwon South Korea
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Jae-Min Kim
Chung-Ang University Anseong South Korea
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The authors implemented a new decay model based on exciton dynamics using transient electroluminescence of fluorescent triplet-triplet annihilation OLEDs. In addition, a predictive model was established using a neural network of multilayer perception, and it demonstrated nearly perfect prediction ability of TTA ratio (determination coefficient, R2 = 0.999).
85.3 - Machine Learning Strategy Toward Inverse Design of Blue TADF Emitter: Training Excited State Properties Based on Density Functional Theory Calculations (9:40 AM - 10:00 AM)
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Hyun-Jung Kim, Junho Lee, Yeol Kyo Choi, Taeyang Lee, Joong-Hwan Yang, Jeongguk Min, Ji-Ho Baek, Seok-Woo Lee, Joon-Young Yang, Soo-Young Yoon
LG Display Co., Ltd. Seoul South Korea
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Sung Moon Ko, Dae-Woong Jeong, Sehui Han
LG AI Research Seoul South Korea
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The authors introduce inverse design strategy utilizing machine learning to discover efficient blue thermally activated delayed fluorescence organic emitters. They utilize a graph neural network to predict the characteristic intrinsic material properties. They discuss consistency between experimental observation and predictions, and examine conditions for improving the accuracy of density-functional theory calculations.
85.4 - Digital Chemistry, Data Processing, and Collaborative Ideation for Development of OLEDs (10:00 AM - 10:20 AM)
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Hadi Abroshan, H. Shaun Kwak, Anand Chandrasekaran, Eric Collins, Paul Winget, David Geisen, Thomas Mustard, Yun Liu, Christopher Brown, Matthew Halls
Schrödinger Inc. New York NY US
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Empowered by digital chemistry and informatics platforms, this study highlights the transformative impact of physics-based simulation, machine learning, and data management in display industry R&D. This technology integration accelerates ideation and decision-making, ensuring swift, accurate, and cost-effective development for next-generation display devices.
Poster Session :
OLEDs Posters
Thursday, May 16, 2024, 5:00 PM – 8:00 PM / San Jose Convention Center, Room 220A
P.194 - New CGL Structure for Improving Leakage of Stacked OLED Devices
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Wei Quan, Juanjuan You, Yongqi Shen, Bin Bo, Menghua Bian, Chun Li, Linlin Wang, Donghui Yu, Shoulei Shi, Guang Yan, Huai-Ting Shi, Jianwei Yu
Hefei BOE Joint Technology Co., Ltd. Beijing China
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A novel CGL structure is designed and studied to improve lateral leakage in OLED devices. Compared with the reference CGL device, the voltage of the new structure device decreases by 0.05v, and the current efficiency increases by 5%. The average value of the color gamut is improved by 5%.
P.195 - Analysis of Impurities in OLED Materials
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Hikaru Takano, Daichi Shirakura
Toray Research Center, Inc. Shiga Japan
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Hiroshi Fujimoto, Chihaya Adachi
Fukuoka i3-Center for Organic Photonics and Electronics Research (i3-opera) & Kyushu University Fukuoka Japan
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The authors conduct combustion ion chromatography, TOF-SIMS, and LC/MS to identify impurities in OLED materials affecting decreased lifetimes. The results of various analyses indicate that the synthesis lot with a low lifetime contains a significant amount of brominated Host-1, and the authors successfully identify the compound responsible for degradation of lifetime.
P.196 - Control of the Molecular Orientation in EML Using Substrate Temperature for Improving the Electro-Optical Characteristics and Lifetime
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Chang-Hee Lee
DongA-University Busan South Korea
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Shin-Han Kim, Yeonjin Yi
Yonsei University Seoul South Korea
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Jeong-Hwan Lee
Inha University Incheon South Korea
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Gi-Dong Lee
Dong-A University Busan South Korea
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The authors control the molecular alignment property of the EML layer in a horizontal direction by changing the substrate temperature (Tsub) during deposition. The molecular anisotropy factor is impacted and it is possible to improve the electro-optical and lifetime performance of the OLED cell through low Tsub.
P.197 - Material Distribution Optimization Toward High-Performance Phosphor-Assisted Fluorescence Devices
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Minghan Cai, Guomeng Li, Bin Liu, Hongyu Wang, Genmao Huang, Xiujian Zhu, Wonjun Song
Visionox Technology Inc. Beijing China
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Dongdong Zhang, Lian Duan
Tsinghua University Beijing China
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Different source arrangements can significantly affect the material distribution within emitting layers of OLEDs. By optimizing the source arrangement, increasing the concentration of the assisted phosphor, and decreasing the concentration of the multi-resonance fluorescent dopant at the interface, the efficiency of phosphor-assisted fluorescence devices can be enhanced by 14%.
P.198 - Ideal Design of Platinum (II) Complex with Bulky Blocking Group for Narrow Emission and High Efficiency in Blue Organic Light-Emitting Diodes
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Kiun Cheong, Seung Won Han, Jun Yeob Lee
Sungkyunkwan University Suwon South Korea
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The authors introduce a blocking group at appropriate position of the ligand for blue platinum (II) complexes. The bulky 2,6-diisopropylphenyl at the 3-position of the carbazole is distorted vertically due to steric hindrance. The photophysical and device properties are improved by suppressing intermolecular interactions, achieving an EQE of 25% with narrow FWHM of 22 nm at 5 wt.% doping.
P.199 - Silicone-Integrated Photolithography of Small-Molecule Phosphorescent Emitter for Ultra-High-Resolution Micro-OLEDs
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Ryungyu Lee, Keun-Yeong Choi, Changhee Lee, Hojin Lee
Soongsil University Seoul South Korea
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Hyukmin Kweon, Borina Ha, Soyeon Lee, Hayoung Lim, Do Hwan Kim
Hanyang University Seoul South Korea
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Seonkwon Kim, Gyurim Park, Youngmin You, Jeong-Ho Cho
Yonsei University Seoul South Korea
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Seunghan Lee, Moon Sung Kang
Sogang University Seoul South Korea
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Hyobin Ham, Bongsoo Kim
Ulsan National Institute of Science and Technology Ulsan South Korea
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Moon-Ki Jeong, Joon Hak Oh
Seoul National University Seoul South Korea
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In this paper, the authors propose ultra-high-resolution organic light-emitting diode (OLED) pixels patterned by conventional photolithography by incorporating silicone into phosphorescent small-molecule networks. This silicone-integrated phosphorescent organic light-emitting diode (SI-phOLED), in which silicone molecules are homogeneously crosslinked with small-molecule light-emitting materials, can effortlessly achieve up to 3,000 ppi ultra-high-resolution patterns using the photolithography process.
P.200 - N-Type Host Derived from Phenyl-Triazine Moiety for Low-Driving Voltage in Blue Phosphorescent Organic Light-Emitting Diodes
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Young Jun Hyun, Seung Won Han, Jun Yeob Lee
Sungkyunkwan University Suwon South Korea
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Dong Chan Lee, Jin Won Sun, Chang Woong Chu
Samsung Display Giheung South Korea
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The authors develop a new host for blue phosphorescent OLEDs: phenyl-triazine type based PTHN-2 with oxasiline functional group, modulating intermolecular distance and electron mobility. A driving voltage of 4.1 V and the external quantum efficiency of 22.0% are achieved, as well as a lifetime increase of more than 100% relative to PTNH-1 with tetraphenylsilane.
P.201 - High Performance and High Color Purity Green OLEDs with Narrow Spectra Emission
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Guomeng Li, Di Zhang, Baoyu Li, Minghan Cai, Hongyu Wang, Wonjun Song
Beijing Visionox Technology Co., Ltd. Beijing China
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Xiujian Zhu
Kunshan Govisionox Optoelectronics Co., Ltd. Kunshan China
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Xiaoqin Jia, Song Liu
Beijing Eternal Material Technology Co., Ltd. Beijing China
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Yuewei Zhang, Dongdong Zhang, Lian Duan
Tsinghua University Beijing China
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The authors introduce a narrow-spectrum green light-emitting layer to a state-of-the-art OLED device structure suitable for mass production. They fabricate a series of pTSF green devices, reaching excellent performance at CIEx 0.17- 0.22, meeting Adobe's green light requirements. These devices have performance comparable to existing phosphorescent devices under DCI-P3 light color.
P.202 - Improvement in the Difference in Light Output from Both Sides of Dual-Emission OLEDs
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Kai Chen, Qiang liu, Jun Wei Liu, Min zhang, Huan Huan zhang, Xiang Liu
Yungu (Gu An) Technology Co., Ltd. Hebei China
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Ru Bo Xing, Jun Feng Li
Kunshan Govisionox Optoelectronics Co., Ltd. Kunshan China
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Organic light-emitting devices (OLEDs) are an effective solution for future dual-emission displays. However, the influence of electrode materials and device structure results in significant differences in the optical performance on both sides. The authors adjust the optical microcavity to balance the brightness and chromaticity from both sides. The structure of an OLED for a dual-emission display has been fabricated.
P.203 - Highly Pure Color and Stable Green Hyperfluorescence Device Through Host Adjustment
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Hae Ung Kim, Paramasivam Palanisamy, Mi Young Chae, Jang Hyuk Kwon
Kyung Hee University Seoul South Korea
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The authors report a fluorescent green emitter based on 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) backbone and its hyperfluroescence (HF) device. The emitter shows high EQE of 20.0%, emission peak at 531 nm with narrow FWHM of 30 nm, and CIE of (0.27, 0.68). Using good host materials, the device realizes a long lifetime (LT90) of 210 h at 3,000 cd/m2.
P.204 - Simulation Study of Temperature Profile on AMOLED Panel under High-Brightness Mode
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Ruiheng Rao, Yangzhao Ma, Hao Dai, Dongliang Dun, Zhiqiang Xia, Kang Yang, Bonggeum Lee
Wuhan Tianma Microelectronics Wuhan China
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The authors present a thermal simulation model to predict the temperature distribution of an AMOLED panel in high-brightness mode. It incorporates panel geometric parameters, stacking configuration, and material properties. The simulation results demonstrate excellent agreement with measurement, with a difference of < 1.5°. This holds significant potential for evaluating OLED display performance and reliability risks and guiding panel wiring design.
P.205 - Exploring Potential of Language Models in OLED Materials Discovery
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Wei Xu, Lan Ma
TCL AI Lab Hong Kong China
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Han Chen
TCL AI Lab Hong Hong China
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Ruifeng He, Xinlong Song, Jingyao Song
Guangzhou China Ray Optoelectronic Materials Co. Ltd. Guangzhou China
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The authors adopt a language-based representation of organic light-emitting diode (OLED) molecules and utilize language models (LMs) to address molecular property prediction and conditional molecular generation. This work demonstrates the great potential of LMs in unifying multi-objective tasks in materials discovery using a simple but efficient framework.
P.206 - Key Factor of Device Lifetime in Exciplex Host-Based Blue Phosphorescent Organic Light-Emitting Diodes
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Seungwon Han, Jun Yeob Lee
Sungkyunkwan University Suwon South Korea
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A study on blue phosphorescent OLEDs shows that using mixed hosts in the emitting layer, especially with Pt emitters, reduces hole trapping and polaron formation. This leads to decreased triplet-polaron annihilation, significantly enhancing the device's lifetime compared to using single hosts, particularly for Pt-doped devices.
P.207 - Enhancing OLED Optical Characteristics Through Simple Fabrication of High-Aspect-Ratio Nanostructures Based on Photosensitive Photopolymer for External Light Extraction
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GeunSu Choi, EunJeong Bae, Byeong-Kwon Ju
Korea University Seoul South Korea
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Young Wook Park
Sunmono University Asan South Korea
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The authors investigated nano-pillar-based light-extraction methods for OLEDs. They explored photosensitive photopolymer (SU-8)-based random nanostructure's impact on light-extraction efficiency, and achieved 85% visible spectrum transmittance, highest efficiency with minimal plane structure thickness. Compared to OLEDs lacking nano-pillar structure, these saw up to 37.5% improved quantum efficiency and 40.4% enhanced power efficiency.
P.208 - Ultra High-Resolution Patterning Technology with Fine Silicon Mask
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Qingyu Huang
BOE Technology Group Co., Ltd. BeiJing China
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Lu Wang, Weijie Wang, Xiaoyun Liu, Fengjie Zhang
BOE Technology Group Co., Ltd. Beijing China
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Zhongyuan Sun, Zhiqiang Jiao, Guangcai Yuan
BOE Technology Group Co., Ltd. China
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The authors explored the relationship of shadowing distance with mask-substrate gap and the relationship of shadowing distance with evaporation angle. These results verify the possibility of manufacturing ultra-high-resolution side-by-side RGB AMOLEDs with >4000 ppi. The study of ultra-high-resolution evaporation patterning needs to be expanded for OLED microdisplays in future.
P.209 - Research on Adhesion of Acrylic Photoresist on Different Substrates for OLED Display
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Ying Shen, Weikang Xiao
Hefei Visionox Technology Co., Ltd. Hefei China
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Chenzhe Li
Tongji University Shanghai China
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Xiujian Zhu
Kunshan Govisionox Optoelectronics Co., Ltd. Kunshan China
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Acrylic photoresist could be applied as a functional layer for OLED displays if compatible with the hybrid substrate of metal and inorganic silicide or the polymer substrate. Through simulation and experiment, adding a silane coupling agent into the formula can significantly improve the adhesion force between the acrylic photoresist and substrate, thereby avoiding peeling.
P.210 - Photolithography Patterning of Organic Light-Emitting Diodes Using Solvent-Resistant Electron Transport Materials
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Hyunjin Yu, Jun Yeob Lee
Sungkyunkwan University Suwon South Korea
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Eun Yeong So, Byung Jun Jung
University of Seoul Seoul South Korea
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Kyunghyun Eun, Myungwoong Kim, Jin-Kyun Lee
Inha University Incheon South Korea
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A novel approach to achieve ultra-high resolution in organic light-emitting diodes (OLEDs) through a photolithography patterning process is developed. A solvent-resistant electron transport layer (ETL) is used. The SBF-Trz ETL demonstrates excellent solvent resistance during photolithography processing and enables device performance comparable to a conventional OLED without any photolithography process.
P.211 - Double Capping Layers Technology for Transparent OLED Display
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Qiang Liu, Wei Jun Liu, Min Zhi Yan, Kai Chen, Min Zhang, Huan Huan Zhang, Xiang Liu
Yungu(Gu'an) Technology Co.,Ltd. Langfang China
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Bo Ru Xing, Feng Jun Li
KunShan Govisionox Optoelectronics Co., Ltd. Jiangsu China
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A double capping layer and transmission sub-pixel scheme are proposed for transparent displays. The brightness of a transparent OLED is increased by 10%, while reflectivity is reduced by 10%. The combination of capping layer (CPL) thickness and transmitted sub-pixel area can better achieve the integration of screen and environment for transparent displays.
P.212 - Novel Stacked OLED and Pixel Design for Enhanced Lifetimes and Improved ppi
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Can Yuan, Xiang Wan, Xinxin Wang, Xiuting Liu, Xiangze Zhang
Hefei BOE Joint Technology Co. Hefei China
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Zhidong Yuan, Xuelian Cheng, Yongqian Li, Jianwei Yu
Hefei BOE Joint Technology Co. China
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A stacked OLED device that consists of a single layer of RGB units stacked vertically about triples the pixel aperture ratio over traditional displays. The color gamut reaches 99% of DCI-P3 (CIE1931) without a color filter. A pixel circuit that theoretically improves the lifetime of the device by about 300% is demonstrated.
P.213 - Management of Light Extraction and Viewing-Angle Behavior of Cavity-Driven Top-Emitting OLEDs with Buckling Patterns
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Byung Doo Chin, Jeong-Yeol Yoo, Sung Min Jo
Dankook University Yongin South Korea
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Different scales of buckling patterns (1D ordered and 2D random) are employed for a light-extracting layer of a top-emission OLED. Improvement of TOLED efficiency and viewing angle is analyzed in terms of the scale of periodic patterns and optical cavity effect. These methods could be utilized as a tool for managing microcavity-driven performance.
P.214 - TADF/Fluorescent Hybrid WOLED Device with Adjustable Color Temperature
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Linlin Wang, Juanjuan You, Menghua Bian, Yongqi Shen, Bin Bo, Wei Quan, Yue Zhang, Ying Cui, Chunjing Hu, Donghui Yu, Chun Li, Li Sun, Huai-Ting Shih, Jianwei Yu
Hefei BOE Joint Technology Co., Ltd. Hefei China
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Guang Yan
BOE Technology Group Co., Ltd. Beijing China
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This study presents a single-structure WOLED using blue fluorescence and yellow TADF materials with a thin p-type interlayer. This structure enables efficient energy transfer, achieving a 10% roll-off from 240 to 3,000 nits from warm to cold white color tuning and a T95 lifetime of 1,300 hours at 1.000 nits.
P.215 - Emission Mechanism-Tuned Fused Indolo[3,2,1-jk]carbazole-Based Multiple Resonance Emitters for Long Device Operational Lifetime
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Jihoon Kang, Seung Chan Kim, Jun Yeob Lee
Sungkyunkwan University Suwon South Korea
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Soon Ok Jeon, Ha Lim Lee
Samsung Electronics Co., Ltd. Suwon South Korea
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In blue organic light-emitting diodes (OLEDs), the importance of terminal emitters, which determine device operational characteristics, has been growing. Although multiple resonance (MR) emitters provide high color purity and high device efficiency, the high triplet energy (ET) of emitters causes issues for long-term device operation. In this work, for stable device operation, emission-mechanism-tuned MR emitters are developed based on a fused indolo[3,2,1-jk]carbazole framework. The fabricated blue OLED records a high quantum efficiency in the deep-blue region of CIEy of 0.075 and a device lifetime twice as long as that of a boron dopant-based device.
P.216 - Status and Trends for Narrow-Bezel OLED Displays
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Wang Jiajun
Visionox Technology Inc Suzhou China
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Guiqi Liu, Lingxiao Du, Meng Zhang, Junfeng Li
Visionox Technology Inc China
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Accomplishing narrow bezels in smartphones is always a hot topic for the OLED field. In this paper, the authors analyze the trend of narrow bezel development and introduce some new methods that may be used in the future, with hopes of providing some helpful reference to OLED panel narrow-bezel design.
P.217 - Improvement of Low Grayscale Black Spots by HTM Morphologies
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Chuanzhi Xu, Tingting Zhang, Xiaoyu Gao, Siming Hu, Zhengfang Xie, Yong Wu, Xiujian Zhu
Visionox Group Suzhou China
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An SPC structure and test model for improving low brightness and low grayscale black spots is developed. The structure can effectively improve the SPC crush problem.
P.218 - Improving Performance and Immersion of Flexible Transparent AMOLED
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Jia Liu, Bo Jiang, Xin Ye Pan, Qiang Liu, Xue Jie Ma
Yungu (Gu'an) Technology Co., Ltd. Langfang China
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In recent years, transparent displays have attracted a lot of attention for wide applications such as smart windows and showcases. The see-through capability, which is closely related to transmittance, reflectivity, haze, and yellowness index, is a key indicator to measure the performance of a transparent display. In this paper, the authors try many methods to further improve the quality of flexible transparent AMOLED. In addition, one bezel-less transparent display has been developed to improve immersion with surroundings.
P.219 - Research on the Direction of Luminance Modulation at Small Angles Based on Microlens
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Yao Li, Wenzhi Fan, Weiqi Xu, Ying Shen, Hui Li
Visionox Technology Inc. Hefei China
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This paper mainly studies the luminance changes of active-matrix organic light-emitting diodes at small angles with different microlens schemes. The luminance curves are analyzed at different angles. Meanwhile, the match of RGB pixel apertures and microlens location is investigated, which could provide luminance modulation at small angles.
P.251 Late-News Poster: OLED Lifetime Optimization in Lower Current-Density Region
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Tomohiko Naganuma, Hayata Aoki, Ryosuke Murata, Michiaki Sakamoto, Takahiro Ushikubo, Masashi Tsubuku, Hiroyuki Kimura
Japan Display Inc. Chiba Japan
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OLED lifetime property was investigated in the lower current-density region. The OLED display is required for an equivalent long lifetime performance in higher and lower current-density regions. It is clarified that hole accumulation at the interface between EBL and EML is important for the blue OLED lifetime property at lower current densities. The device simulation shows that the appropriate EML hole barrier affects the carrier distribution.
P.252 Late-News Poster: Deep Learning-Based Inverse Design Technology for White Organic Light-Emitting Diode Thin-Film Structure
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In-Goo Lee, Sehong Park, Daeheung Lee, Injue Kim, Kwon-Shik Park, Sooyoung Yoon
LG Display Co. Seoul South Korea
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Jeong Min Shin, Chanhyung Park, Min Seok Jang
Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea
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The authors propose a reverse design technique for WOLEDs using an artificial neural network. The inverse neural network is trained by combining forward and inverse neural networks and predicts the thin-film structure from the out-coupling spectrum. The predicted structures have a low error rate of less than 9 percent, demonstrating effectiveness of the inverse neural network.
P.253 Late-News Poster: Evaluation of the Stability of Electroluminescent Materials Using Polaron Pair Formation Kinetics
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Hyunsoo Moon, Euihyun Lee, Man Jae Park, Chang Woo Lee, Nari Ahn
Samsung Display Company Yongin South Korea
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The researchers develop a method for evaluation of the stability of electroluminescent materials by a quantum efficiency measurement system. Relative photoluminescence intensity decay of blue dopants with blue hosts under UV light are measured and the rate constants for polaron pair formation are determined through first-order kinetics analyses. The rate constants of polaron pair formation are inversely proportional to the lifetime of OLED devices.
P.254 Late-News Poster: Design Optimization and Mass Production Considerations for 2D Hole-Arrayed Double-Anode Structure for Improving Outcoupling Efficiency of OLEDoS
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Dogi Lim
Samsung Display Co. & Korea University Yongin South Korea
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June-Young Park, Seungwon Lee, Jian Cheng Bi, Seonghyeon Park, Junbeom Song, Ji-Sung Lee, Hyejung Lim
Korea University Seoul South Korea
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Byeong-Kwon Ju
Samsung Display Co. & Korea University Seoul South Korea
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An AR/VR headset for the “metaverse” is one of the candidates to widen human life experiences with virtual reality. Display requirements for headsets include high resolution up to 3,000 ppi that needs to enhance outcoupling efficiency of OLED (OLEDos). The authors optimized 2D hole-arrayed top anodes for mass production with materials, thickness of anode and interlayer, process variation of etching top anode, and particles of double anodes. Outcoupling efficiency of optimized structure is improved to 1.377 fold over conventional TE-OLEDs.
P.255 Late-News Poster: Comparison Between Conventional Current Density-Voltage-Luminance (JVL) and Displacement Current-JVL (DC-JVL) Measurement for OLEDs
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Masaru Inoue
TOYOTech LLC Fremont CA US
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Masanobu Mizusaki
Sharp Display Technology Corporation Nara Japan
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Hideyuki Murata
Japan Advanced Institute of Science and Technology Ishikawa Japan
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The authors propose the simultaneous measurement of a displacement current and current density-voltage-luminance (DC-JVL). They measure RGB OLED samples and obtain the difference between charge recombination voltages and emission voltages in low-current-density regions. They also confirm that the DC-JVL has higher sensitivity than the conventional JVL from the measurement of current efficiency vs. current-density characteristics.
P.256 Late-News Poster: Enhancement of OLED Color-Conversion Efficiency and Viewing-Angle Dependency Using Organic Color-Conversion Layers
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Youngrok Kim, Jiho Roh, Min Chul Suh
Kyung Hee University Seoul South Korea
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Applying the host-dopant system to organic color-conversion layers has resulted in the development of a highly efficient color-conversion layer. The author measures the light emitted from a blue LED (480 nm). The organic color-conversion layer exhibits an impressive color-conversion efficiency of 123.08%, surpassing that of InP QD by 61.34%. Furthermore, it is observed that the viewing-angle characteristics can be significantly improved.
P.257 Late-News Poster: Highly Efficient Geometrically Stretchable Organic Light Emitting Diodes with Angle-Independent Narrow-Band Emission
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Ajay Nimbalkar, Aqsa Irfan, Min Chul Suh
Kyung Hee University Seoul South Korea
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Herein, we demonstrated the first highly efficient geometrically stretchable top-emitting organic light-emitting diode by incorporating the pre-stretched optical adhesive (OA) film. The enhancement of device efficiencies with light extraction phenomenon brought by the nanowavy corrugated structures of OA substrate. GSOLED shows stability in stretchable conditions and displays narrowband emission with color purity. The device shows very high current efficiency and EQE of 221 cdA-1 and 51 %.
P.258 Late-News Poster: New Approach for Achieving Perfect Black in WOLED
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Minhyung Kim, Sudong Roh, Chungsun Lim, Taerim Lee, Sungjoon Bae, Woosup Shin, Hyeonwoo Lee
LG Display Co., Ltd. Paju South Korea
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OLED displays have excellent black characteristics as a self-emitting device, but in the bottom emission structure, reflections from external light are generated by the use of highly reflective metal electrodes. In order to control this, an appropriate anti-reflective function for each wavelength has been given to the film to realize neutral black. In this paper, the authors propose a new method to realize more neutral black and high-clarity CR by adjusting the QWP and surface treatment of the pol layer and panel technology that affect the reflective properties.
P.259 Late-News Poster: ViP-Based RGB Tandem OLED Display with a White Light Emission Current Efficiency over 134 cd/A
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Mengzhen Li, Hui Pang
Hefei Visionox Technology Ltd. Hefei China
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Bin Liu
Visionox Technology Inc. Kunshan China
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Jing Zhao, Shuyue Ma
Yungu (Gu'an) Technology Co., Ltd. Gu'an China
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Zhenhua Lou, Dawei Sun, Qiqi Ren
Hefei Visionox Technology Ltd China
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Minghan Cai, Wonjun Song
OLED Technology Platform, Visionox Technology Inc. China
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Hongyu Wang, CC Lee
Hefei Visionox Technology Ltd. China
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Xiujian Zhu
Visionox Technology Inc. China
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In this paper, the authors demonstrate a very competitive RGB tandem OLED based on ViP technology that shows low power consumption and long lifetime. Compared to the traditional single OLED for mass production, panels based on tandem OLED can reduce power consumption by 29% and increase lifetime by more than 3.3 times. In combination with ViP technology, 8% efficiency improvement is obtained by optimizing the light-emitting layer positions of RGB tandem OLEDs and thickness of cathode and capping layer (CPL), respectively, achieving a white light emission current efficiency over 134 cd/A.
P.260 Late-News Poster: Doping Ratio Control of Organic Composite Layer in OELDs by Spectroscopic Ellipsometry
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Jaisun Kyoung, Younggil Park, Nari Ahn
Samsung Display Asan South Korea
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The OLED industry needs a reliable nondestructive process control method for measuring doping or mixing ratios. Using spectroscopic ellipsometry, the authors apply thickness and doping ratio monitoring for emission and mixed electron transport layer on glass. They determine the optical constants of samples. They adopt the effective medium theory and the bandgap difference to monitoring doping ratios. The resulting developed monitoring tool can measure imperceptible differences in doping ratios.