有机发光二极管
系统间交叉
准分子
磷光
量子效率
激子
量子产额
光电子学
共发射极
材料科学
光致发光
二极管
单重态
荧光
纳米技术
原子物理学
光学
激发态
物理
量子力学
图层(电子)
作者
Kiran Kishore Kesavan,Jayachandran Jayakumar,Ming Lee,Herbert Chen,Sujith Sudheendran Swayamprabha,Deepak Kumar Dubey,Fu‐Ching Tung,Ching‐Wu Wang,Jwo‐Huei Jou
标识
DOI:10.1016/j.cej.2022.134879
摘要
Exciton generation and charge balance play a dominant character in organic light-emitting diode (OLED). Performance concerning power management is a crucial requirement in consumer electronics. Improving exciton generation requires key considerations, such as excellent intermolecular charge transfer and high predisposition for effective electron-hole recombination in suitable energy levels with high delayed fluorescent quantum yield and reduced non-radiative decay. Forming exciplex by physically blending with suitable material provides the feasibility in tailoring the parameters mentioned above for effectively improving the exciton generation. Herein, we comprehensively study the exciplex forming host by blending the carbazole-based hole transporting material BCC-36 with triazine-based materials PO-T2T, and 3P-T2T as electron transporting material designed and investigated. Developed exciplex formation host showed a high photoluminescent quantum yield of 90% with prolonged emission, representing our exciplex system with good TADF ability. Thus, effective utilization of non-radiative triplet excitons via reverse intersystem crossing results in high device performance with a maximum external quantum efficiency (EQE) of 20% and the current efficacy of 41 cd A−1 by using the exciplex system as a sole emitter. In addition, the high-performing exciplex system was investigated as a co-host for conventional fluorescent (C545T), phosphorescent (Ir(ppy)2(acac)) and TADF (4CzIPN) compounds as the emitters are utilized for high-efficiency OLEDs. Remarkably, the corresponding doped device system showed a high EQE of 12.5 % (C545T), 32.5% (Ir(ppy)2(acac)) and 26.5% (4CzIPN) under optimized solution-processed device conditions.
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