Abnormal fluorescence behavior of some cyanine dyes in a cyanine dye-TiO2 colloids system

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	Abnormal fluorescence behavior of some cyanine dyes in a cyanine dye-TiO2 colloids system
	Xiang, JF ; Chen, CP ; Zhou, BM ; Xu, GZ
刊名	CHEMICAL PHYSICS LETTERS
	1999-12-31
卷号	315 期号:5-6 页码:371-378
ISSN号	0009-2614
英文摘要	The absorption and fluorescence spectra of five typical cyanine dyes adsorbed on the surface of TiO2 colloids have been studied. The absorption spectra show that there are two kinds of isomer produced by intramolecular torsional motion of these dyes in their ground states. The fluorescence quantum yields of these dyes may be enhanced or reduced in the presence of TiO2 colloids. This behavior can be understood by a consideration of whether the reduction of radiationless transition quantum yields of intramolecular torsional motion in the excited singlet states (1)dye, (phi(Tr,nr)(0) - phi(Tr,nr)), are larger or smaller than phi(ET), the quantum yield for electron transfer from their (1)dye to the conduction band of TiO2. ESR results indicate that the dye shows an ESR signal at g = 2.005 if (phi(Tr,nr)(0) - phi(Tr,nr)) is smaller than phi(ET), otherwise it gives no ESR signal in the presence of TiO2. The relationships between the enhancement or reduction in fluorescence quantum yields and structures of these dyes are discussed. (C) 1999 Elsevier Science B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000084649300009
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/75103]
专题	中国科学院化学研究所
通讯作者	Chen, CP
作者单位	1.Acad Sinica, Inst Photog Chem, Beijing 100101, Peoples R China 2.Acad Sinica, Inst Chem, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Xiang, JF,Chen, CP,Zhou, BM,et al. Abnormal fluorescence behavior of some cyanine dyes in a cyanine dye-TiO2 colloids system[J]. CHEMICAL PHYSICS LETTERS,1999,315(5-6):371-378.
APA	Xiang, JF,Chen, CP,Zhou, BM,&Xu, GZ.(1999).Abnormal fluorescence behavior of some cyanine dyes in a cyanine dye-TiO2 colloids system.CHEMICAL PHYSICS LETTERS,315(5-6),371-378.
MLA	Xiang, JF,et al."Abnormal fluorescence behavior of some cyanine dyes in a cyanine dye-TiO2 colloids system".CHEMICAL PHYSICS LETTERS 315.5-6(1999):371-378.