Cold sintering of CsPbBr3 quantum dots embedded KBr ceramics for LED displays

Thanks to their tunable luminescence, narrow emission range, and superior color fidelity, perovskite quantum dots (PeQDs) are widely considered as promising materials for next-generation backlight displays. However, the susceptibility to degradation and failure when exposed to ambient environment significantly hampers their widespread applications. Herein, we reported an effective strategy to encapsulate CsPbBr 3 nanocrystals into robust KBr matrix via cold sintering process at 120 °C. The well prepared translucent CsPbBr 3 @KBr ceramic displays a narrow green photoluminescence (with a full-width at half-maximum of ∼22 nm) and an quantum yield of 73.6% with remarkable thermal stability. By incorporating red emitting K 2 SiF 4 :Mn 4+ phosphor into the KBr matrix, the color gamut of the constructed white LED improves to 118% of the National Television System Committee (NTSC) standard, suggesting that the thermally robust and narrow-band green emitter holds significant promise for wide-color-gamut liquid crystal displays. • An effective strategy to encapsulate CsPbBr 3 nanocrystals into robust KBr matrix via cold sintering process at 120 °C. • Quantum efficiency could be retained more than 90% of the raw CsPbBr 3 @KBr powder. • The white LED can reach 118% of a National Television System Committee standard. • This work is the first example of PeQD-in-ceramic bulk converter using translucent ceramic as matrix.