报告题目：Highly Efficient Blue Thermally Activated Delayed Fluorescence Emitters Based on Rigid Donor and Acceptor Moieties
报 告 人：Prof. Jang Hyuk Kwon (Kyung Hee University)
报告摘要：Organic light-emitting diodes (OLEDs) utilizing thermally activated delayed fluorescence (TADF) materials are very promising due to high efficiency and good possible lifetime characteristics. However, achievement of highly efficient pure deep blue TADF materials is still challenging. In this study, new deep blue TADF emitters with rigid donor and acceptor moieties are reported. Our synthesized emitters show deep blue photoluminescence (PL) peaks at near 450~460 nm and high PLQY of over 90%. Fabricated TADF blue devices with our synthesized emitters show high EQE of 25.7%~39.8% with color coordinate of (0.14, 0.15) ~ (0.15, 0.32). When we applied the hole type and low polarity host material, our TADF blue devices indicate very deep blue color of (0.14, 0.07) ~ (0.14, 0.15) and high EQE of over 20%. The detailed our emitter design concept with its characteristics will be discussed at the presentation.
报告题目：The Effect of Interface Mixing in Solution Processed OLEDs
报 告 人：Prof. Min Chul Suh (Kyung Hee University)
报告摘要：Solution processed OLED have recently attracted a great deal of attention because it enables a low cost manufacturing. However, this process may cause lots of problems in material selection since the interface mixing occurs seriously during continuous wet process. In particular, such interface mixing is understood to cause significant deterioration in device lifetime although it does not seem to significantly affect the device efficiency or operating voltage. In this presentation, we discuss the effects of interface mixing on device stability of solution processed OLEDs. In addition, we discuss how to improve the device lifetime even in these situations. Besides, a Laser Induced Thermal Imaging (LITI) process will be introduced as an alternative technology to solve such issues. There will be an introduction of promising way to fabricate micro-cavity OLEDs (organic light emitting diodes) with the concept of ‘‘super top emission’’ with soluble optical path-length compensation layer (OPCL) formed by Laser Induced Thermal Imaging (LITI) technology.