Enhanced the stability of perovskite quantum dots CsPbBr3 by in-situ growth on nanosheets Kaolin for WLED applications

Abstract

Lead halide perovskite quantum dots have become a greatly promising material for photoelectronic applications. However, the simultaneous promotion of both high photoluminescence quantum yield (PLQY) and excellent stability is still a major challenge. In this article, we fabricated CsPbBr3 @Kaolin composites using nanosheet Kaolin as template by in-situ growth method. The structure, luminescent properties, especially for stability of heat, water and UV irradiation are systematically researched. The optimization of relative proportion of Kaolin and CsPbBr3 is obtained. The optimized CsPbBr3 @Kaolin composites show that the PLQY (95.6%) is considerably higher than pure CsPbBr3 QDS (76.25%). It is fascinating that the composite displays remarkably enhanced stability under water, thermal, and light irradiation conditions. As high PLQY of optimized CsPbBr3 @Kaolin composites, it is selected CIE colour coordinate monochromatic light encompassed 111% of NTSC color gamut. The white LED with bright natural white light is successfully achieved. The in-situ growth method proposed in this paper provides a brand-new method for obtaining ultra-stable quantum dots (QDS).