Composition Regulation Enables Stable CsPbBr3/Cs4PbBr6 Glass Nanocomposites for Color-Rich Backlight Displays

In this work, CsPbBr₃/Cs₄PbBr₆@glass composites were synthesized by incorporating lead carbonate (PbCO₃) into a lithium–aluminum–silicate–boron (Li–Al–Si–B) glass matrix. PbCO₃ decomposes to PbO, which reacts in situ with melt Br to form PbBr₂, triggering CsPbBr₃/Cs₄PbBr₆ nucleation in Br-rich microdomains; CO₂ release concurrently creates stress-relieving micropores, outperforming direct PbBr₂ addition. This composite exhibited remarkable photoluminescence properties, with a photoluminescence quantum yield (PLQY) reaching as high as 86.71%. In an accelerated aging experiment conducted over 120 h, the fluorescence intensity was maintained at 95% of its original value. Even after 60 days of immersion in water, the luminescence intensity remained at 94% of the initial intensity, demonstrating its outstanding resistance to environmental degradation. To further explore its potential for display applications, we prepared a CsPbBr₃/Cs₄PbBr₆/CsPbBrI₂@glass@polystyrene (PS) film. This film exhibited an impressive color gamut, covering 123% of the National Television System Committee (NTSC) 1953 standard and 91.3% of the ITU-R Recommendation BT.2020 (Rec.2020) standard. The high PLQY and excellent stability of CsPbBr₃/Cs₄PbBr₆@glass make it highly suitable for LCD applications and offer broad prospects for industrial-scale production.