Precipitation promotion of highly emissive and stable CsPbX3 (Cl, Br, I) perovskite quantum dots in borosilicate glass with alkaline earth modification

Perovskite quantum dots (QDs) have been considered as excellent luminescent materials that can replace traditional phosphors in backlit display field due to their narrow emission and high photoluminescence quantum yield (PLQY). However, the problems of rapid aging and luminescence quenching seriously affect their practical applications. One of the effective strategies to improve the stability is to prepare the QDs in glass. Herein, highly quality perovskite QDs embedded borosilicate glasses have been successfully prepared with the introduction of alkaline earth metals. With the help of alkaline earth, the further precipitation of perovskite QDs from glass can be promoted and then the heat-treatment temperature and time decreased. The crystallization principle, luminescence performance, and stability are studied in detail. The intrinsic PLQY of the optimal perovskite QDs glass powder exceeds 95%. The perovskite QDs glass powder was mixed with epoxy resin to form a flexible film. Both the QDs glass powder and film could still emit bright light under ultraviolet light when immersed in 90 °C hot water. The color gamut of LED based on QDs glass film reaches 112% of the NTSC standard, 158% of the sRGB standard, showing its strong potential applications in the backlit display field.