Manifestation of geminate and bimolecular stages of triplet-exciton annihilation in the kinetics of singlet fission in organic semiconductors

被引：0
|
作者：
Shushin, A. I. [1 ]
机构：
[1] RAS, NN Semenov Fed Res Ctr Chem Phys, Kosygin St 4, Moscow 119991, Russia
来源：
CHEMICAL PHYSICS LETTERS | 2023年 / 811卷
关键词：
Prompt and delayed fluorescence; Singlet fission; Triplet excitons; Diffusion assisted processes; RECOMBINATION KINETICS; THIN-FILMS; MODEL; WELL;
D O I：
10.1016/j.cplett.2022.140199
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The manifestation of short-time (geminate) and long-time (bimolecular) stages of diffusion-controlled triplet--triplet annihilation (TTA) in the kinetics of singlet fission (SF) (i.e. splitting of the excited singlet state S*1 into a pair of T-excitons) in molecular organic semiconductors are analyzed in detail. In this analysis, the short-and long-time parts of the SF-kinetics (kinetics of fluorescence I(t) from S*1-state), are assumed to be governed by geminate and bimolecular TTA, respectively. Within the analysis, the analytical formula is derived, which is shown to fairly accurately describe the experimental SF-kinetics in the wide range of times.
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页数：7
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