中国物理B ›› 2006, Vol. 15 ›› Issue (10): 2347-2351.doi: 10.1088/1009-1963/15/10/026
余汉城1, 王 惠2, 张 伟2, 林位株2, 黄锦汪3, 计亮年3
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
摘要: 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.
中图分类号: (Polymers; organic compounds)