High luminescence and long-term stability: CsPbBrI2@glass optimized by Li2O for high quality backlight display

All-inorganic CsPbX 3 (X=Cl, Br, I) perovskite quantum dots (QDs) have garnered extensive attention due to excellent optical properties. However, practical applications have been hampered by their instability. Dense amorphous glass protected CsPbX 3 perovskite QDs with excellent long-term stability are ideal conditions for developing high-quality liquid crystal displays (LCD). In this paper, CsPbBrI 2 QDs are precipitated in a novel aluminosilicate glass matrix. This work shows that the network structure of aluminosilicate glass is “modified” by Li 2 O. As the Li 2 O content increases, the glass network structure can be connected into a more aggregation state. This modification of Li 2 O increased the photoluminescence quantum yield (PLQY) of CsPbBrI 2 @glass (CPBI@G) from 22 % to 86 %. Surprisingly, CPBI@G exhibits excellent long-term stability against water, heat, and light. The specially designed CsPbX 3 @glass@PET light conversion film achieves a wide-color-gamut of 123.7 % of the NTSC 1953 standard. The film displays colors richer than commercial displays, paving the way for the commercial use of the CPBI@G nanocomposite in backlight displays.