A new V-shaped organic fluorescent compound integrated with crystallization-induced emission enhancement and intramolecular charge transfer.

TitleA new V-shaped organic fluorescent compound integrated with crystallization-induced emission enhancement and intramolecular charge transfer.
Publication TypeJournal Article
Year of Publication2013
AuthorsGu P-Y, Zhang Y-H, Liu G-Y, Ge J-F, Xu Q-F, Zhang Q, Lu J-M
JournalChemistry, an Asian journal
Volume8
Issue9
Pagination2161-6
Date Published2013 Sep
Abstract

The emission behavior of a new V-shaped organic fluorescent compound (p,p′-bis(2-aryl-1,3,4-oxadiazol-5-yl)diphenyl sulfone (OZA-SO)), consisting of diethylamino (donor) and sulfone (acceptor) units, has been studied in various polar solvents and with different morphologies. As expected, there is the gradual transition from the locally excited state to the intramolecular charge-transfer (ICT) state with the increasing solvent polarity. The photoluminescence intensity of OZA-SO initially decreases with a low water fraction (f(w)), owing to ICT effect, and then increases with a high f(w), owing to crystallization-induced emission enhancement. At the same time, the fluorescence lifetime of OZA-SO increases from 0.062 ns in dimethylformamide (DMF) to 5.80 ns in a solution containing 90 % water, and then to 7.49 ns in a solution containing 60 % water. Furthermore, the solid-state emission of OZA-SO can be tuned reversibly from green to yellow by fuming/grinding or fuming/heating owing to morphological changes. This color-switchable feature of OZA-SO may have potential applications in optical-recording and temperature-sensing materials.

DOI10.1039/c3cc44217a
Alternate JournalChem Asian J