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

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 colortunable FL and UOP emissions are captured, exhibiting promising potential in the information encryption and anti-counterfeiting fields.