The temperature dependence of the spin relaxation of coupled polaron pairs in organic semiconductors

被引：1
|
作者：
Yin, Sun [1 ]
Gao, Kun
Xie, S. J.
Liu, D. S.
机构：
[1] Shandong Univ, Dept Phys, Jinan 250100, Peoples R China
来源：
ORGANIC ELECTRONICS | 2015年 / 25卷
关键词：
Temperature; Spin relaxation; Stochastic processes; Organic magnetic field effect; DELAYED FLUORESCENCE; CHARGE-TRANSPORT; ENERGY; MAGNETORESISTANCE;
D O I：
10.1016/j.orgel.2015.07.004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The coupled polaron pair distributed in adjacent organic molecules has spin relaxation due to molecular vibration. We construct a Hamiltonian with on-site energy fluctuation to investigate its temperature dependence. The relaxation occurs between spin singlet and one of the spin triplet states, but not between spin triplet states. It is found that the polaron pair finally relaxes to a spin state with half probability in spin singlet state and 1/6 probability in each of the spin triplet states, and the relaxation time is inversely proportional to the temperature's square. The connection to the magneto-electroluminescence experiment is also discussed. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：329 / 334
页数：6
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