High-Efficiency Circularly Polarized Electroluminescence from TADF-Sensitized Fluorescent Enantiomers
High-Efficiency Circularly Polarized Electroluminescence from TADF-Sensitized Fluorescent Enantiomers
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TADF 敏化荧光对映体的高效圆偏振电致发光
DOI：
10.1002/anie.202108011
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发表时间：
2021-08-13
影响因子：
16.6
通讯作者：
Chen, Chuan-Feng
中科院分区：
文献类型：
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作者：
Li, Meng;Wang, Mei-Ying;Chen, Chuan-Feng
开发了几种适用于高效率TADF敏化CP-OLED发光体的荧光对映体。对映体具有构型稳定性，PLQY高达98%，k（r）为7.8 × 10（7）s（-1），|g（lum）|值约为2.5x10（-3）。值得注意的是，通过使用可匹配的TADF敏化剂，然后利用对映体作为发射体来制造CP-0 LED。TADF敏化的CP-OLED不仅表现出镜像的CPEL活性，g（EL）值为+1.8x10（-3）和-1.4x10（-3），而且还表现出快速启动的特点，其低V-T为3.0 V，在10000 cd m（-2）下的驱动电压为4.8 V。TADF敏化的荧光器件在1000和10000 cd m（-2）下的EQE（max）分别为21.2%和15.3%，表现出21.5%的高EQE（max）和极低的效率衰减。所获得的EQE与CP-TADF发射体的EQE相当，这为突破CP-FL发射体的EL效率极限提供了有希望的前景。
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(r) of 7.8x10(7) s(-1), and intense CPL activities with |g(lum)| values of about 2.5x10(-3). 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(EL) values of +1.8x10(-3) and -1.4x10(-3), but also display fast start-up featuring with low V-T of 3.0 V as well as driving voltage of 4.8 V at 10 000 cd m(-2). Meaningfully, the TADF-sensitized fluorescent devices show high EQE(max) of 21.5 % and extremely low efficiency roll-off, whose EQEs are 21.2 % and 15.3 % at 1000 and 10 000 cd m(-2), 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.