Geminate charge pair recombination in sensitized photoconducting polymer

被引：18

作者：

Abramavicius, D ^{[1
]}

Gulbinas, V ^{[1
]}

Ruseckas, A ^{[1
]}

Undzenas, A ^{[1
]}

Valkunas, L ^{[1
]}

机构：

[1] Inst Phys, LT-2600 Vilnius, Lithuania

来源：

JOURNAL OF CHEMICAL PHYSICS | 1999年 / 111卷 / 12期

关键词：

D O I：

10.1063/1.479819

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：

Recombination kinetics of the geminate charge pairs, generated by photoexcitation of charge transfer (CT) complexes in sensitized poly-N-epoxypropylcarbazole, have been investigated by transient absorption and time-resolved fluorescence techniques and modeled by Monte Carlo method. The quantitative agreement of simulations with experimental data is obtained by assuming the distance between the thermalized charge pairs to be several times longer than the typical distance between electron donor and acceptor in CT complexes. Faster recombination is observed in the films with higher sensitizer concentrations and explained by assuming that electron acceptor molecules act as scattering centers for hole motion during thermalization, thus reducing the thermalization distance. The dynamical blue shift of the fluorescence band and comparison of hole density with fluorescence kinetics suggest that heterogeneity of CT complexes results in different radiative probabilities and in distribution of the initial charge pair separation distances. (C) 1999 American Institute of Physics. [S0021-9606(99)51236-1].

引用

页码：5611 / 5616

页数：6

共 25 条

[1] CHARGE TRANSPORT IN DISORDERED ORGANIC PHOTOCONDUCTORS - A MONTE-CARLO SIMULATION STUDY [J].