Synthesis and Luminescence Properties of CsPbX@Uio-67 Composites toward Stable Photoluminescence Convertors.

All-inorganic halide perovskite (CsPbX, X = Cl, Br, or I) nanocrystals (NCs) have been widely studied due to their outstanding optoelectronic properties. However, some inevitable factors like light, heat, and moisture affected the stability of CsPbX NCs and further limited their practical application. In this work, the stability of all-inorganic halide perovskite NCs can be improved by integrating them in the stable Zr-based metal-organic frameworks (Uio-67). Compared to pristine perovskite NCs, typical CsPbBr@Uio-67 composites display a stable photoluminescence property that can be maintained for 30 days under ambient atmospheric conditions. Due to the proposed confinement effects of CsPbX NCs coordinated with the pore structures of Uio-67, the related structural model of CsPbX@Uio-67 composites was elucidated. White LED device was further fabricated by combining CsPbBr@Uio-67 composites and commercial KSiF:Mn red phosphors with a blue-emitting chip, which demonstrated a wide color gamut (138% of National Television Standards Committee color space). The strategy on encapsulation of CsPbX NCs into Uio-67 will open up a stable platform for optoelectronic applications.