Dual-emission CPB@SMSO@SiO2 composites with tunable afterglow through energy transfer

[Display omitted] •The study employed a straightforward two-step process to combine afterglow materials with quantum dots, followed by hydrolytic coating to produce core–shell materials.•Tunable afterglow color was achieved by energy transfer between Sr2MgSi2O7: Eu2+, Dy3+and CsPbBr3.•Optical performance and stability were improved by introducing Sr2MgSi2O7: Eu2+, Dy3+, and silica coatings. Afterglow materials face limitations in color variety, low luminosity, and stability. Thus, developing materials with adjustable afterglow color, increased photoluminescence (PL) intensity, and enhanced stability is crucial. This paper reports the fabrication of a series of core–shell composites, CPB@SMSO@SiO2, which combine Sr2MgSi2O7: Eu2+, Dy3+ (SMSO) and lead halide perovskite quantum dots (CsPbBr3/CPB PeQDs) through a process involving in-situ growth and hydrolytic coating. The SMSO in the composite can absorb 365 nm UV light and then emit 470 nm light, which can be absorbed by the CsPbBr3 PeQDs, resulting in an overall increase in the PL intensity of the composite. The afterglow color can be turned from green to blue by adjusting the ratio of SMSO and CsPbBr3. Furthermore, the stability of the composites is improved by the SiO2 shell layer formed by hydrolysis of tetramethyl orthosilicate (TMOS). This study presents an opportunity to develop innovative afterglow materials.