Layered B2O3/CsPbBr3 perovskite composite embedded using glass as microreactor with enhanced stability and high-efficiency light extraction

Abstract

Lead halide perovskite quantum dots are considered to be one of the best candidates for the next generation of light conversion materials. However, their practical application is greatly hindered by its intrinsic poor stability and once exposed to air, heat moisture and illumination. Here, we report a novel reaction scheme that allows the simultaneous production of high-quality CsPbBr3 nanocrystals (NCs), self-healing process that optimized the crystallinity of CsPbBr3 NCs, and the formation of a protective coating layered structure of a densely packed two-dimensional B2O3 crystals with the assistance of water. Due to the inherent refractive index mismatch in the B2O3-CsPbBr3-B2O3 (B-C-B) laminated structure, excellent light extraction efficiency was achieved. The resulted layered B2O3/CsPbBr3 perovskite composite showed exceptionally high photoluminescence quantum yield (PLQY ∼90%) and excellent stability over 2 years under normal storage condition. A high-performance backlight liquid crystal display (LCD) was designed as B2O3/CsPbBr3 @ K2SiF6: Mn4+ (KSF: Mn4+) @ polydimethylsiloxanes (PDMS) monolithic film, which featured an optimal white emission (with correlated color temperature of 5327 K), that covered 130% of NTSC standard color gamut area of CIE1931, thereby demonstrating a great application potential in the optoelectronics industry.