https://pubs.acs.org/doi/abs/10.1021/acs.inorgchem.8b03295

All-inorganic halide perovskite (CsPbX₃, 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 CsPbX₃ 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 CsPbBr₃@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 CsPbX₃ NCs coordinated with the pore structures of Uio-67, the related structural model of CsPbX₃@Uio-67 composites was elucidated. White LED device was further fabricated by combining CsPbBr₃@Uio-67 composites and commercial K₂SiF₆:Mn⁴⁺ 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 CsPbX₃ NCs into Uio-67 will open up a stable platform for optoelectronic applications.