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Starburst Type Benzofuroindolocarbazole Donor for High Efficiency and Long Lifetime in Thermally Activated Delayed Fluorescence Emitters
Advanced Optical Materials ( IF 9 ) Pub Date : 2020-11-10 , DOI: 10.1002/adom.202001432
Do Sik Kim 1 , Sung Joon Yoon 1 , Kyung Hyung Lee 1 , Jun Yeob Lee 1 , Wan Pyo Hong 2
Affiliation  

A series of thermally activated delayed fluorescence (TADF) emitters of 5‐(4,6‐diphenyl‐1,3,5‐triazin‐2‐yl)‐2‐(15‐phenylbenzofuro[3,2‐a]indolo[3,2‐c]carbazol‐10(15H)‐yl)benzonitrile (TrzCNTrx1) and 5‐(4,6‐diphenyl‐1,3,5‐triazin‐2‐yl)‐2‐(10‐phenylbenzofuro[3,2‐a]indolo[3,2‐c]carbazol‐15(10H)‐yl)benzonitrile (TrzCNTrx2) are developed through a molecular design strategy that incorporates a starburst type benzofuro[3,2‐a]indolo[3,2‐c]carbazole as a rigid donor. The benzofuro[3,2‐a]indolo[3,2‐c]carbazole is developed as a strong and rigid donor for strong charge transfer character in the TADF emitter in combination with a diphenyltriazine acceptor and a benzonitrile linker. Two starburst type donors with different active sites for the aromatic linker substitution are prepared. Among the TrzCNTrx1 and TrzCNTrx2 emitters, the TrzCNTrx2 emitter shows a small singlet–triplet energy gap below 0.10 eV, high photoluminescence quantum yields over 90%, and short exciton lifetimes less than 5.0 µs. In the device application, the TrzCNTrx2 emitter shows maximum external quantum efficiency of 20.6% with little efficiency roll‐off less than 2% at 3000 cd m−2 and color coordinate of (0.37, 0.57). Moreover, the TrzCNTrx2 device is much better than the TrzCNTrx1 in terms of device lifetime because of short delayed fluorescence lifetime.

中文翻译:

Starburst型苯并呋喃吲哚并咔唑供体,可在热活化延迟荧光发射体中实现高效率和长寿命。

一系列5-(4,6-二苯基-1,3,5-三嗪-2-基)-2-(15-苯基苯并呋喃[3,2- a ]吲哚[3]的热激活延迟荧光(TADF)发射器,2 c ]咔唑-10(15 H)-基)苄腈(TrzCNTrx1)和5-(4,6-二苯基-1,3,5-三嗪-2-基)-2-(10-苯基苯并呋喃[3] ,2- a ] indolo [3,2 - c ]咔唑-15(10 H)-基)苄腈(TrzCNTrx2)是通过分子设计策略开发的,该策略结合了爆炸形苯并呋喃[3,2- a ] indolo [3 ,2- c ]咔唑作为刚性供体。苯并呋喃[3,2‐ a ]吲哚[3,2‐ c]咔唑是与二苯基三嗪受体和苄腈连接基结合使用的一种强而刚性的供体,可在TADF发射体中实现强大的电荷转移特性。制备具有不同活性位点用于芳族接头取代的两个星暴型供体。在TrzCNTrx1和TrzCNTrx2发射器中,TrzCNTrx2发射器显示出小于0.10 eV的单重态-三重态能隙,超过90%的高光致发光量子产率和短于5.0 µs的激子寿命。在设备应用中,TrzCNTrx2发射器显示出最大的外部量子效率为20.6%,而在3000 cd m -2时几乎没有效率下降小于2%颜色坐标为(0.37,0.57)。此外,由于延迟的荧光寿命短,TrzCNTrx2器件在器件寿命方面比TrzCNTrx1更好。
更新日期:2021-01-04
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