TADF敏化荧光对映体产生的高效圆偏振电致发光
High-Efficiency Circularly Polarized Electroluminescence from TADF-Sensitized Fluorescent Enantiomers.
作者信息
Li Meng, Wang Mei-Ying, Wang Yin-Feng, Feng Liheng, Chen Chuan-Feng
机构信息
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
出版信息
Angew Chem Int Ed Engl. 2021 Sep 13;60(38):20728-20733. doi: 10.1002/anie.202108011. Epub 2021 Aug 13.
A couple of fluorescent enantiomers, which are suitable for the emitters of high-efficiency TADF-sensitized CP-OLEDs, have been developed. The enantiomers show configurational stability, high PLQY of 98 %, large k of 7.8×10 s , and intense CPL activities with |g | values of about 2.5×10 . Notably, by using matchable TADF sensitizer, the enantiomers were then exploited as emitter to fabricate CP-OLEDs. The TADF-sensitized CP-OLEDs not only show mirror-image CPEL activities with g values of +1.8×10 and -1.4×10 , but also display fast start-up featuring with low V of 3.0 V as well as driving voltage of 4.8 V at 10 000 cd m . Meaningfully, the TADF-sensitized fluorescent devices show high EQE of 21.5 % and extremely low efficiency roll-off, whose EQEs are 21.2 % and 15.3 % at 1000 and 10 000 cd m , respectively. The obtained EQEs are comparable to those of CP-TADF emitters, which provides a promising perspective to break through the EL efficiency limit of CP-FL emitters.
已经开发出几种适用于高效热激活延迟荧光（TADF）敏化的圆偏振有机发光二极管（CP-OLED）发光体的荧光对映体。这些对映体表现出构型稳定性、98%的高荧光量子产率（PLQY）、7.8×10⁶ s⁻¹的大k值以及|g|值约为2.5×10⁻³的强烈圆偏振发光（CPL）活性。值得注意的是，通过使用匹配的TADF敏化剂，这些对映体随后被用作发光体来制造CP-OLED。TADF敏化的CP-OLED不仅表现出g值分别为+1.8×10⁻³和 -1.4×10⁻³的镜像圆偏振电致发光（CPEL）活性，还具有快速启动特性，在10000 cd·m⁻²时低开启电压为3.0 V以及驱动电压为4.8 V。有意义的是，TADF敏化的荧光器件显示出21.5%的高外量子效率（EQE）和极低的效率滚降，在1000和10000 cd·m⁻²时其EQE分别为21.2%和15.3%。所获得的EQE与CP-TADF发光体的EQE相当，这为突破CP-FL发光体的电致发光效率极限提供了一个有前景的前景。
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