系统间交叉
激发态
荧光
接受者
单重态
光化学
材料科学
辐射传输
自发辐射
化学
原子物理学
激光器
物理
光学
凝聚态物理
作者
Jingyao Chen,Xiaoxiao Xiao,Shuai Li,Yuai Duan,Wei Guo,Yi Liao,Qian Peng,Hongbing Fu,Hua Geng,Zhigang Shuai
标识
DOI:10.1021/acs.jpclett.2c00224
摘要
It is well-known that thermally activated delayed fluorescence (TADF) is always generated from charge-transfer (CT) excited states in donor-acceptor (D-A) systems, which limits its application owing to a slow radiative process and a small stimulated emission cross section. Herein, a design strategy is proposed for realizing TADF from a locally excited (LE) state without a typical donor-acceptor type structure through controlling the intersystem crossing (ISC) and reverse intersystem crossing (RISC) processes between the lowest excited singlet with LE character and higher triplet states. Using this strategy, a boron difluoride derivative is theoretically predicted and experimentally synthesized to exhibit locally excited TADF (LE-TADF) with a fairly large radiative rate of 1.12 × 108 s-1, extremely fast RISC rate of 5.09 × 1010 s-1, and a large stimulated emission cross section of 4.35 × 10-17 cm2, making this a promising organic amplified spontaneous emission (ASE) material. This work might open a new avenue to extend TADF materials, especially TADF laser emitters.
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