基于七元环三芳胺给体的蓝光热活化延迟荧光材料的构筑
Construction of Blue Thermally Activated Delayed Fluorescence Materials Based on the Heptagonal Triarylamine Donor
Received date: 2023-12-07
Revised date: 2024-01-23
Online published: 2024-02-20
Supported by
National Natural Science Foundation of China(22275127)
设计合成高效发光材料对于蓝光有机发光二极管(OLED)的进一步研究和应用至关重要. 以扭曲七元环结构的9H-三苯并[b,d,f]氮杂䓬(TPA)为给体, 设计合成了两种新型蓝光发光分子TRZCz-TPA和TRZ-TPA, 并对它们的热稳定性、电化学性质、光物理性质和器件性能等进行了表征. 光谱研究表明, TRZCz-TPA和TRZ-TPA均为蓝光发射, 其甲苯溶液中的发射波长分别为455和440 nm. 和TRZ-TPA分子不同的是, TRZCz-TPA的受体邻位引入3,6-二叔丁基咔唑(tBuCz), 产生较大的空间位阻, 使得二苯基三嗪(TRZ)受体构型扭曲, 与苯环π-桥平面存在较大二面角, 从而最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)分别转移到tBuCz给体和TRZ受体上, 其发光性质由TPA给体到TRZ受体的沿键电荷转移特性(TBCT)转变为tBuCz给体到TRZ受体的空间电荷转移特性(TSCT), 单三线态能隙(ΔEST)从0.53 eV显著降至0.04 eV, 具有热活化延迟荧光(TADF)性质. 此外, 大位阻的tBuCz给体可以降低聚集态下的发光猝灭现象, 因此, TRZCz-TPA掺杂薄膜的光致发光量子产率(PLQY)为42.0%, 掺杂器件的最大外量子效率(EQEmax)为10.4%, 而TRZ-TPA的PLQY和EQEmax仅为6.5%和3.7%.
李治 , 李祯龙 , 刘俊杰 , 憨卫国 , 游劲松 , 宾正杨 . 基于七元环三芳胺给体的蓝光热活化延迟荧光材料的构筑[J]. 有机化学, 2024 , 44(6) : 2006 -2013 . DOI: 10.6023/cjoc202312006
The development of efficient blue light-emitting materials is a crucial yet challenging task in organic light-emitting diodes (OLED). Two novel blue light-emitting molecules, TRZCz-TPA and TRZ-TPA, have been designed and synthesized based on the heptagonal 9H-tripheno[b,d,f]nitrozoafluorene (TPA) donor. Their thermal stability, electrochemical properties, photophysical properties, and device performances were characterized. TRZCz-TPA and TRZ-TPA both exhibit blue emission in toluene solution with emission peaks at 455 and 440 nm, respectively. In contrast to TRZ-TPA, which exhibits through-bond charge transfer (TBCT) from the TPA donor to the diphenyltriazine (TRZ) acceptor, TRZCz-TPA, featuring two adjacent 3,6-di-tert-butylcarbazole (tBuCz) donors near the TRZ acceptor, demonstrates through-space charge transfer (TSCT) from the tBuCz donors to the TRZ acceptor. This leads to a remarkable reduction in the singlet-triplet energy gap (ΔEST) from 0.53 eV to 0.04 eV, thereby displaying thermally activated delayed fluorescence (TADF) properties. Additionally, tBuCz donor with large steric hindrance effectively suppresses aggregation-induced quenching in the aggregated state. Consequently, TRZCz-TPA achieves a photoluminescence quantum yield (PLQY) of 42.0% and a maximum external quantum efficiency (EQEmax) of 10.4% in OLED devices, significantly outperforming TRZ-TPA (PLQY=6.5%, EQEmax=3.7%).
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