Glass Network Structure Adjustment and Particle Size Screening to Obtain Ultra-Stable Luminescent Perovskite Glass and Its Application
Halide perovskite nanocrystals (PNCs) exhibit high photoluminescence quantum yield (PLQY), narrow full width at half maximum (FWHM), and high color purity, yet their intrinsic instability under ambient, thermal, and photonic stress restricts deployment in optoelectronic devices. Embedding CsPbX3 (X = Br, I) PNCs within inorganic glass matrices mitigates degradation, but dense glass networks impede nucleation and growth. This work adjusts the GeO2-SiO2-B2O3 glass network via B2O3 addition to create loose, compact structures that facilitate PNC precipitation. Optimized CsPbBr3@Glass achieves a PLQY of 85%. Glass powders with varying particle sizes are screened for stability, identifying an optimal size range. Composite films of CsPbX3@Glass@PS (X = Br, I) with polymer materials yield light conversion films. Under 120 h blue light irradiation, green-light samples outperform red-light samples in stability. In situ heating-cooling cycles show thermal recovery exceeding 90% for green and 86% for red samples. A white light-emitting diode (WLED) constructed with CsPbBr3@Glass, CsPbBrI2@Glass, and a 460 nm InGaN chip achieves a color gamut covering 123% of NTSC 1953 and 91.8% of Rec 2020. An LCD incorporating green CsPbBr3@Glass@PS and red CsPbBrI2@Glass@PS films with a 450 nm mini-blue chip retains >90% of initial PL intensity after 15 days in 95% ethanol, demonstrating dual protection from glass and polymer. These results establish a pathway for stable, wide-gamut display backlights.