INHOMOGENEOUS BROADENING OF ORGANIC-DYES IN POLYMERIC MEDIA - NONLINEAR TRANSMISSION SPECTRA AND PHOTOCHEMICAL KINETICS

被引:18
作者
BONDAR, MV [1 ]
PRZHONSKA, OV [1 ]
TIKHONOV, YA [1 ]
机构
[1] ACAD SCI UKRAINE,INST PHYS,PROSPECT NAUKI 46,KIEV 252650,UKRAINE
关键词
D O I
10.1021/j100205a043
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
The paper deals with a new approach to studies of inhomogeneous broadening of vibronic spectra of organic dyes in the polymeric medium at the room temperature. The effects of inhomogeneous broadening are shown to influence such photophysical processes as nonlinear light absorption by dyes solutions and also linear and nonlinear photobleaching. For the first time spectral dependences of the nonlinear light absorption are studied and a 10-fold decrease in the critical saturation intensity of the bleaching in the polymeric matrix as compared to the liquid medium is observed. A model was developed of the spectral inhomogeneous ensemble of molecules in the amorphous polymeric matrix which takes into account the configurational relaxation in the excited state. We also estimated the time of recovery of the primary distribution of molecules at the ground state. The spectral dependence of the bleaching quantum yield of dyes in the polymeric medium is obtained, which extends opportunities for investigations of inhomogeneous broadening at excitations not only in the region of 0-0 transition but also within the whole absorption band.
引用
收藏
页码:10831 / 10837
页数:7
相关论文
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