激发态
吩嗪
接受者
光化学
有机发光二极管
电致发光
材料科学
光致发光
猝灭(荧光)
量子效率
荧光
化学
光电子学
原子物理学
纳米技术
物理
光学
凝聚态物理
生物化学
图层(电子)
作者
Changjiang Zhou,Shengbing Xiao,Man Wang,Wenzhe Jiang,Haichao Liu,Shi‐Tong Zhang,Bing Yang
标识
DOI:10.3389/fchem.2019.00141
摘要
Throwing light upon the structure-property relationship of the excited state properties for next-generation fluorescent materials is crucial for the organic light emitting diode (OLED) field. Herein, we designed and synthesized three donor-acceptor (D-A) structure compounds based on a strong spin orbit coupling (SOC) acceptor benzo[a, c]phenazine (DPPZ) to research on the three typical types of excited states, namely, the locally-excited (LE) dominated excited state (CZP-DPPZ), the hybridized local and charge-transfer (HLCT) state (TPA-DPPZ), and the charge-transfer (CT) dominated state with TADF characteristics (PXZ-DPPZ). A theoretical combined experimental research was adopted for the excited state properties and their regulation methods of the three compounds. Benefiting from the HLCT character, TPA-DPPZ achieves the best non-doped device performance with maximum brightness of 61,951 cd m-2 and maximum external quantum efficiency of 3.42%, with both high photoluminescence quantum efficiency of 40.2% and high exciton utilization of 42.8%. Additionally, for the doped OLED, PXZ-DPPZ can achieve a max EQE of 9.35%, due to a suppressed triplet quenching and an enhanced SOC.
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