192
S. Wang et al. / Dyes and Pigments 89 (2011) 188e192
absorption spectral changes, the fluorescent is also changed as
shown in Fig. 4b. The BTE-Br/DPC/PMMA thin film showed
maximum fluorescent emission at 600 nm with 405 nm light
excitation, which originate the maximum fluorescent emission of
DPC dye. Upon irradiation with 254 nm light, the fluorescent
intensity at 600 nm is gradually decreased and almost wholly
Acknowledgements
This work was supported by National Natural Science Founda-
tion of China (No. 20802065). The project sponsored by the
Scientific Research Foundation for the Returned Overseas Chinese
Scholars, State Education Ministry (No. 2009-1001). This research
was also supported by the Doctoral special funds of Zhanjiang
Normal University (No. ZL0803).
quenched with irradiation light prolong. Upon visible (l > 540 nm)
light irradiation, the fluorescent intensity at 610 nm is recovered
the initial state. This indicated the fluorescence emission of DPC dye
can be also controlled by BTE-Br in PMMA solid film, which can be
constructed the fluorescent photoswitching. The Fig. 4b inset
showed the modulated fluorescent emission peak intensity at
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. Conclusion
In conclusion, we construct a fluorescent switch which is con-
sisted of photochromic BTE-Br blending with DPC fluorescent dye.
It showed excellent fluorescence switching function in solution and
doped in PMMA films with UV and visible-light irradiation,
respectively. A facile approach to realizing erasable and rewritable
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