In situ precipitation of high efficiency and high thermostability CsPbBr3 quantum dots in borosilicate glass for wide color gamut display.

In situ precipitation of CsPbBr 3 quantum dots (QDs) in glass is considered as one of the effective methods to overcome its instability and to achieve practical applications. However, it still faces the great challenges of low photoluminescence quantum yield (PLQY), poor thermostability and photostability at present. Herein, we successfully prepared CsPbBr 3 QDs in situ within a well-designed glass matrix (CsPbBr 3 QDs@glass), which exhibits symmetric narrowband emission at 523 nm with a full width at half maximum (FWHM) of 25 nm, giving a PLQY of up to 52.15 % under 455 nm excitation. Meanwhile, it can keep 45.25 % of the initial luminescence intensity at 373 K, better than that of most reported CsPbBr 3 QDs@glass materials. As a demonstration of a conceptual application, a white LED backlight strip was fabricated at home by encapsulating CsPbBr 3 QDs@glass composite and K 2 SiF 6 :Mn4+ red phosphor on blue chips with silicone, achieving a wide color gamut of 128.6 % and 95.8 % of NTSC and Rec. 2020 color gamut, respectively. The assembled CsPbBr 3 QDs@glass-based LCD screen exhibits excellent color reproduction and color saturation. All these results demonstrate that this CsPbBr 3 QDs@glass composite material is a promising green emitter for wide color gamut LCD display. [ABSTRACT FROM AUTHOR]