Modulating the local structure of glass to promote in situ precipitation of perovskite CsPbBr3 quantum dots by introducing a network modifier

All-inorganic CsPbBr3 perovskite quantum dots (QDs) with high quantum efficiency (QE) and exceptional color purity show great potential in the field of wide-color-gamut backlit displays. However, their fragile stability is considered as a crucial obstacle towards their practical applications. Herein, high-quality CsPbBr3 QDs were regulated to be precipitated in borosilicate glass by introducing a network modifier, CaF2, which not only gives high internal quantum efficiency (IQE) and external quantum efficiency (EQE) up to 44.3% and 34.6% upon 455 nm excitation, respectively, but also presents a narrow bandwidth (FWHM of 26 nm). The roles of Ca ions and F ions on the nucleation/growth of CsPbBr3 QDs in glass (CsPbBr3 QDs@glass) are revealed in detail. Benefitting from superior optical performance and high stability of the CsPbBr3 QDs@glass composite, a white LEDs covering 127% of NTSC 1953 standard was fabricated and its potential application in LCD screens was also demonstrated. This study provides a guide for the synthesis of CsPbBr3 QDs embedded glasses with high QE by introducing the related nucleation inducing agents and increasing the interstitial space.