Reversible Switching of the Emission of Diphenyldibenzofulvenes by Thermal and Mechanical Stimuli
Xiaoliang Luo(Beijing Normal University), Jienian Li(Beijing Normal University), Cuihong Li(Beijing Normal University), Liping Heng(Hong Kong University of Science and Technology), Yong Qiang Dong(Hong Kong University of Science and Technology), Zhengping Liu(Beijing Normal University), Zhishan Bo(Beijing Normal University), Ben Zhong Tang(Hong Kong University of Science and Technology)
Cited by 654
Abstract
The thermochromic and mechanochromic fluorescence of diphenyldibenzofulvenes is investigated. Emission is boosted and blue-shifted upon crystallization. Yellow emissive crystals of the material transform to green fluorescent crystals upon heating before melting. Reversible switching of the emission color and efficiency are achieved by repeated amorphization and crystallization of dye molecules by a pure thermal process or grinding–heating cycles.
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