1610038-33-9Relevant academic research and scientific papers
Aggregation-induced emission, mechanochromism and blue electroluminescence of carbazole and triphenylamine-substituted ethenes
Chan, Carrie Y. K.,Lam, Jacky W. Y.,Zhao, Zujin,Chen, Shuming,Lu, Ping,Sung, Herman H. Y.,Kwok, Hoi Sing,Ma, Yuguang,Williams, Ian D.,Tang, Ben Zhong
, p. 4320 - 4327 (2014)
Carbazole and triphenylamine-substituted ethenes are synthesized [Ph 2CCPh(R), R = 9-carbazolyl, 9-hexyl-3-carbazolyl and 4-(diphenylamino)phenyl] and their optical properties are investigated. All luminogens are nonemissive when molecularly dissolved in good solvents but become highly emissive in the aggregated state, showing a phenomenon of aggregation-induced emission. High solid-state fluorescence quantum yields up to 97.6% have been achieved in their solid thin films. The luminogens are thermally stable, showing high degradation temperatures of up to 315 °C. They exhibit mechanochromism: their emissions can be repeatedly switched between blue and green colors by simple grinding-fuming and grinding-heating processes due to the morphological change from crystalline to amorphous state and vice versa. Multilayer light-emitting diodes with device configurations of ITO/NPB/dye/TPBi/Alq3/LiF/Al, ITO/NPB/dye/TPBi/LiF/Al and ITO/dye/TPBi/LiF/Al are fabricated, which emit sky blue light with maximum luminance, current efficiency, power efficiency and external quantum efficiency of 11700 cd m-2, 7.5 cd A-1, 7.9 lm W-1 and 3.3%, respectively.
