Title
Polymorphs of a diarylethene that exhibits strong emission and direct visualization of polymorphic phase transition process by fluorescence color change
Author
Daichi Kitagawa, Tatsumoto Nakahama, Katsuya Mutoh, Yoichi Kobayashi, Jiro Abe, Hikaru Sotome, Syoji Ito, Hiroshi Miyasaka, Seiya Kobatake
Year
2016
Journal
Dyes and Pigments
Abstract
Luminescent solid-state materials with high fluorescence quantum yield have attracted much attention in application to organic optoelectronics. In the course of study of photochromic diarylethene crystals, we found that two polymorphic forms of a diarylethene are obtained by recrystallization from acetone and n-hexane solutions. Surprisingly, both polymorphic crystals exhibited strong emission whose fluorescence quantum yield (>0.5) is much higher than that in n-hexane solution (0.017). Furthermore, the thermodynamic solid-state polymorphic phase transition was found and the process was directly visualized by a fluorescence color change.
Instrument
FP-8300
Keywords
Fluorescence, Quantum yield, Solid state, Materials