The effect of intermolecular interactions on photoluminescence of a porphyrin side-chain polymer
Wang Hui (王惠)a, Zhang Wei (张伟)a, Yu Han-Cheng (余汉城)b, Huang Jin-Wang (黄锦汪)ab, Lin Wei-Zhu (林位株)a, Ji Liang-Nian (计亮年)ab
a State Key Laboratory of Optoelectronic Materials and Technologies of Zhongshan University, Guangzhou 510275, China; b Institute of Chemistry and Chemical Engineering of Zhongshan University, Guangzhou 510275, China
Abstract Photoluminescence properties and exciton decay dynamics in a porphyrin side-chain polymer, poly[porphyrin acrylate- acrylonitrile (abbreviated p[(por)A-AN]), have been investigated by femtosecond time-resolved photoluminescence spectroscopy. All the luminescences of p[(por)A-AN] films are due to the emissive decay of the photoexcited singlet excitons in the porphyrins. The luminescence efficiencies and lifetimes are increased for samples from pure films to dilute blend films. However, they are increased as the intrachain concentration of the porphyrin sidechain groups is decreased. The intrachain rotation motions of porphyrin sidechain groups result in the initial ultrafast luminescence decays, which are much faster than those due to the interchain interactions. All the samples show no significant red-shift and broadening of the transient luminescence spectra. The interchain and intrachain nonradiative exciton relaxation processes may play an important role in the luminescence dynamics in the p[(por)A-AN] films. The possible origin of different intrachain and interchain dynamic behaviours in p[(por)A-AN] films is discussed.
Received: 01 October 2005
Revised: 01 June 2006
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 60478013，20571089 and 10274107), the Natural Science Foundation of Guangdong Province, China (Grant No 05101819), and the Doctoral Program Foundation of Institute of Higher E
Cite this article:
Wang Hui (王惠), Zhang Wei (张伟), Yu Han-Cheng (余汉城), Huang Jin-Wang (黄锦汪), Lin Wei-Zhu (林位株), Ji Liang-Nian (计亮年) The effect of intermolecular interactions on photoluminescence of a porphyrin side-chain polymer 2006 Chinese Physics 15 2347
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