In Situ Construction of Ultra-Stable CsPbX<sub>3</sub>/DMSNs-NH<sub>2</sub> Nanocomposites for White Light-Emitting Devices

All-inorganic halide perovskite (CsPbX<sub>3</sub>) nanocrystals\n(NCs) have garnered significant attention due to their excellent photoelectric\nproperties. However, their practical application has been limited\nby stability issues. This study presents a strategy combining physical\nconfinement through a carrier matrix and chemical bond coupling to\nenhance the stability of CsPbX<sub>3</sub> NCs significantly under\nUV irradiation, polar solvents, and thermal conditions. Specifically,\nCsPbBr<sub>3</sub> NCs exhibited near-complete fluorescence quenching\nwithin 300 min when treated with water and ethanol. In contrast, CsPbBr<sub>3</sub>/DMSNs-NH<sub>2</sub> nanocomposites retained 86.9% and 75.4%\nof their initial photoluminescence intensity after 7 days. This enhanced\nstability is attributed to the multilevel pore architecture of DMSNs-NH<sub>2</sub>, which effectively prevents direct interaction with water\nand oxygen. Furthermore, bright white light-emitting diode (LED) devices\nwere successfully fabricated using these nanocomposites, achieving\na color temperature of 6045 K and a color gamut covering 133.5% of\nNTSC and 99% of Rec.2020 standards. This work demonstrates a promising\npathway for the development of stable, high-performance perovskite-based\noptoelectronic devices.