Fig. 1: Preparation of highly efficient deep-blue OURTP materials.

a, d Molecular interactions between CA and TMA before (a) and after (d) the water implement. b Molecular structures of CA and TMA, and preparing procedures of their composites (CT). c, e Steady state and phosphorescent (phos.) spectra and photographs under (UV on) or after (UV off) 254 nm irradiation of CT5-0 (c) and CT5-20 (e).