Session and scheduling information are listed below. Select a session from the list and press "Go" to view the abstracts for that session.
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) 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
Yonsei 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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Jin Won Sun, Dong Chan Lee, 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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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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Byung Jun Jung, Eun Yeong So
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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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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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, Yong Wu, Xiujian Zhu
Visionox Technology Inc. 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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The 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 was 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 showed 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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We 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: The Evaluation on 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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We developed the method for evaluation of the stability of electroluminescent materials by quantum efficiency measurement system. Relative photoluminescence intensity decay of blue dopants with blue hosts under UV light were measured and the rate constants for polaron pair formation were determined through first-order kinetics analyses. The rate constants of polaron pair formation were inversely proportional to the lifetime of OLED devices.
P.254 Late-News Poster: Design Optimization and Considering Mass Production of 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
Korea University Seoul South Korea
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AR, VR Headset for “metaverse” is one of candidates to widen human life experiences with virtual reality. Display requirement for headset is high resolution as to 3000ppi that needs to enhance outcoupling efficiency of OLED (OLEDos). We optimized 2D hole arrayed top anode 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 folds than conventional TE-OLEDs. We hope that this study promotes more approaches to excite SPPs of anode.
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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We propose the simultaneous measurement of a displacement current and current density-voltage-luminance (DC-JVL). We measured RGB OLED samples and obtained the difference between charge recombination voltages and emission voltages in low current density regions. We also confirmed 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. I measured the light emitted from a blue LED (480nm). The organic color conversion Layer exhibited an impressive Color Conversion Efficiency of 123.08%, surpassing that of InP QD by 61.34%. Furthermore, It was observed that the viewing angle characteristics could 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 of 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, we would like to 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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In this paper, we demonstrated a very competitive RGB tandem OLED based on ViP technology that showed 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 was 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 OLEDs industry needs a reliable nondestructive process control method for measuring doping or mixing ratio. Using spectroscopic ellipsometry, we applied to thickness and doping ratio monitoring for emission and mixed electron transport layer on glass. We determined the optical constants of samples. We adopted the Effective Medium Theory and the bandgap difference to monitoring doping ratio. In result developed monitoring tool can measure imperceptible difference doping ratio.