Tunable luminescent color from green to blue on long afterglow materials using CsPbBr3 quantum dots

The single color of long afterglow luminescence materials is one of the important factors restricting its development. Here, we uniformly disperse all-inorganic cesium lead halide (CsPbBr 3 ) perovskite quantum dots (PeQDs) with strong stability on the surface of Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS) to adjust the afterglow luminescence color. CsPbBr 3 PeQDs has high quantum yield, and its excitation spectrum (around 400–500 nm) overlaps with the emission spectrum (around 465 nm) of SMS, so that the tunable afterglow emission from blue (around 465 nm) to green (around 525 nm) can be achieved by controlling the dosage of CsPbBr 3 PeQDs, and its chromaticity coordinates can be from (0.1280, 0.1360) to (0.2010, 0, 7460). The quantum yield of the composite remains almost unchanged, and the luminescence intensity remains stable and does not decrease when the composite is irradiated by ultraviolet light for 2 h; When exposed to air, the luminescence property remained about 80 percent after 10 days. This study provides a research direction for the polychromatic adjustment of long afterglow luminescent materials.