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.
Stepwise locking of phenyl rings of tetraphenylethene increases the emission efficiency of luminogen solutions gradually, thus verifying the restriction of intramolecular rotation (RIR) mechanism of the aggregation induced emission phenomenon. The emission of the luminogen with one "O" bridge could be tuned reversibly in solid state through repeated heating and grinding.
Luminogens exhibiting reversible multicolored emission switching in the solid state have been seldom reported though they are of theoretical and practical importance. Through introduction of weak interaction to the propeller-like molecules, we obtained two tetraphenylethene derivatives exhibiting morphology dependent multicolored emissions. The emissions of the two compounds could be switched reversibly among three colors in the solid state by reversible transforming among three different aggregation states of the luminogens when treated with different stimuli.Hence a possible strategy to construct luminogen exhibiting reversible multicolored emission swithching is disclosed.
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