Network-Texture-Induced Uniform Nucleation: Controllable Preparation and Application of High-Performance CsPbI3 Nanocrystals in Al3+/Gd3+ Co-Doped Glass.

CsPbI3 nanocrystals were precipitated in situ within Al3+- and Gd3+-modified borosilicate-zinc glass through melt-quenching and subsequent heat treatment. Structural and spectroscopic analyses reveal that Al3+ acts primarily as a network former, consuming nonbridging oxygens and strengthening the glass network, which suppresses excessive crystal growth and produces more uniform nanocrystals (∼4.49 nm) with enhanced luminescence and prolonged lifetime. In contrast, Gd3+ serves as a network modifier, partially relaxing the rigid glass framework and promoting nanocrystal growth. The resulting lattice distortion and strengthened quantum-confinement effect contribute to a blue shift in emission. Benefiting from the synergistic roles of Al3+ and Gd3+, the optimized sample (CPIAG0.4) exhibits a photoluminescence quantum yield of 31.29% together with excellent thermal and moisture stability, retaining its emission intensity after prolonged water immersion. A white LED fabricated from this material achieves a color gamut of 125.2% of the NTSC 1953 standard, while its application as an X-ray scintillation screen delivers a spatial resolution of 14 LP mm-1. These results highlight cooperative ion doping as an effective strategy for engineering perovskite nanocrystal glasses for photonic and imaging applications.