Reversible fluorescence modulation based on photochromic diarylethene and fluorescent coumarin
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dong Peng, Hongbing Fu, and Jiannian Yaoa) Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
Yuanyuan Liu and Yaobing Wang Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China; and Graduate School, Chinese Academy of Sciences, Zhongguancun, Beijing 100080, People’s Republic of China (Received 19 July 2006; accepted 26 January 2007)
A fluorescence switch by the photoisomerization of a photochromic compound in CH3CN and in a polymer film using a bistable photochromic (1,2-bis(2-methylbenzo[b]thiophen-3-yl) hexafluorocyclopentene) (BTF6) and a fluorescent 3-(2-benzothiazolyl)-7-(diethylamino) coumarin (coumarin6) was demonstrated. Because only the closed form of BTF6 serves as a fluorescence quencher of coumarin6, and the read (406 nm), write (254 nm), and erase (>500 nm) wavelengths are well-separated, a reversible modulation of the fluorescence of coumarin6 with high contrast and high sensitivity is expected to be realized. This system may represent an alternative to the fluorescence switches that are based on covalent systems in the potentially long-term optical data or image storage schemes utilizing luminescence intensity readout.
I. INTRODUCTION
Fluorescent switches based on photoisomerization have attracted considerable attention during recent years, and a change of the fluorescence intensity is probably one of the most attractive properties for photoswitching devices because of its excellent properties such as high sensitivity, high resolution, and high contrast.1–8 Photochromic diarylethenes have a high potential for applications in optoelectronic devices, such as opticalmemory media and switching devices.8–15 Fluorescence switches based on the photoisomerization of diarylethenes have been extensively studied. In these systems, multifunctional molecules combining bistable photochromic diarylethene units with fluorescent ones have been investigated with the aim of application to ultrahigh-density optical-memory media, and they have shown reversible photoswitching relying on intramolecua)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/JMR.2007.0199 1558 J. Mater. Res., Vol. 22, No. 6, Jun 2007 http://journals.cambridge.org Downloaded: 13 Mar 2015
lar fluorescence-quenching processes.16–22 However, these molecules are often difficult in design and synthesis, and the inherent photochromic properties of diarylethene and fluorescent properties of the dyes may be affected by each other. An alternative approach, in which the fluorescent dyes are doped into the photochromic molecules, has been shown recently, and good fluorescence intensity contrasts have been achieved by choosing a suitable combination of photochromic molecules and fluorescent molecules.23–26 Here in the present work, we report on a simple
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