Scattering processes between bipolaron and exciton in conjugated polymers

被引：28
|
作者：
Sun, Z. [2 ]
Li, Y. [2 ]
Xie, S. J. [2 ]
An, Z. [1 ]
Liu, D. S. [2 ,3 ]
机构：
[1] Hebei Normal Univ, Coll Phys, Shijiazhuang 050016, Peoples R China
[2] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Peoples R China
[3] Jining Univ, Dept Phys, Qufu 273155, Peoples R China
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 20期
基金：
中国国家自然科学基金;
关键词：
bipolarons; electroluminescence; excitons; polymers; probability; LIGHT-EMITTING-DIODES; CONDUCTING POLYMERS; POLARONS; ELECTROLUMINESCENCE; RESONANCE;
D O I：
10.1103/PhysRevB.79.201310
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The scattering processes between a bipolaron and an exciton in a conjugated polymer chain are investigated by numerical simulations based on the model extended with an external electric field of Su It is found that there are two channels for these scattering processes. In one channel, the exciton is annihilated and the bipolaron dissociates into a polaron and an excited polaron. In the other channel, the bipolaron and the exciton are converted into each other. Furthermore, the probabilities for these two channels are calculated, and we found that they depend sensitively on the strength of the electric field. Our results show that the interactions of bipolaron-exciton open a channel to enhance the quantum efficiency of electroluminescence due to radiative decay of the excited polaron.
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页数：4
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