Color-tunable fluorescence and ultralong organic room temperature phosphorescence from multicomponent copolymers

Abstract

Materials with color-tunable photoluminescence (PL) have attracted dramatically increasing interest in recent years, especially the tuning of both fluorescence (FL) and ultra-long organic room temperature phosphorescence (UOP). Herein, a series of polymer films are successfully fabricated by in situ copolymerization of carbazole derivatives, lanthanide complex, and acrylamide (AM). With a long lifetime of 2.82 s and a high quantum yield of 21.40%, these copolymers exhibit not only color-tunable FL from violet-red to blue, but also multicolor UOP scope from blue to chartreuse when the excitation wavelength is changed. Moreover, a nearly-white phosphorescence can also be observed by adjusting the excitation wavelength. Multiple information patterns with color-tunable FL and UOP emissions are captured, exhibiting promising potential in the information encryption and anti-counterfeiting fields.