Highly efficient room-temperature phosphorescent materials with a heavy-atom effect of bromine

Abstract

Room-temperature phosphorescent (RTP) materials with long luminescence lifetimes have stimulated considerable interest. However, pure organic molecules with persistent room-temperature phosphorescence are still rarely reported. In this work, we study two molecules, DCzMPh and TCzMPh, in which persistent room-temperature phosphorescence in the amorphous state is achieved via the heavy-atom effect of bromine atoms in their structure. Their final quantum yields are found to be as high as 90 and 93%, respectively, at the phosphorescence lifetimes of 0.27 and 0.28 s, respectively. Moreover, both molecules are shown to be appropriate for security protection applications.