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Session 37 :
OLED Devices II
OLEDs

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)
  • Oskar Sachnik, Xiao Tan, Paul Blom, Gert-Jan Wetzelaer
    Max Planck Institute for Polymer Research Mainz Germany


  • 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.
05/15/2024 10:40 AM 05/15/2024 11:00 AM America/Los_Angeles Efficient Single-Layer Blue-Emitting OLEDs 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. San Jose McEnery Convention Center LL21CD Oskar Sachnik, Xiao Tan, Paul Blom, Gert-Jan Wetzelaer
37.2 - Impact of Thermal Factors on Carrier Density in OLED under Low-Voltage Condition (11:00 AM - 11:20 AM)
  • Sang Ho Jeon, Jungmin Moon, Jeongsu Park, Yo Seoph Ko, Donghoon Kim
    Samsung Display Co., Ltd. Gyunggi South Korea


  • 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.
05/15/2024 11:00 AM 05/15/2024 11:20 AM America/Los_Angeles Impact of Thermal Factors on Carrier Density in OLED under Low-Voltage Condition 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. San Jose McEnery Convention Center LL21CD Sang Ho Jeon, Jungmin Moon, Jeongsu Park, Yo Seoph Ko, Donghoon Kim
37.3 - Donor-Acceptor Alignment and Charge Separation in Small-Molecule Organic Semiconductors (11:20 AM - 11:40 AM)
  • Artem Fediai, Tobias Neumann, Franz Symalla, Timo Strunk
    Nanomatch GmbH Karlsruhe Germany


  • 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.
05/15/2024 11:20 AM 05/15/2024 11:40 AM America/Los_Angeles Donor-Acceptor Alignment and Charge Separation in Small-Molecule Organic Semiconductors 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. San Jose McEnery Convention Center LL21CD Artem Fediai, Tobias Neumann, Franz Symalla, Timo Strunk
37.4 - Degradation Analysis on Li-doped Organic Charge-Generation Layer (11:40 AM - 12:00 PM)
  • Ki Ju Kim, Dohyeon Yoo
    Hongik University Seoul South Korea

  • Taekyung Kim
    Hongik University Sejong South Korea


  • 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.
05/15/2024 11:40 AM 05/15/2024 12:00 PM America/Los_Angeles Degradation Analysis on Li-doped Organic Charge-Generation Layer 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. San Jose McEnery Convention Center LL21CD Taekyung Kim