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

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 CsPbBr 3 @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 CsPbBr 3 is obtained. The optimized CsPbBr 3 @Kaolin composites show that the PLQY (95.6%) is considerably higher than pure CsPbBr 3 QD S (76.25%). It is fascinating that the composite displays remarkably enhanced stability under water, thermal, and light irradiation conditions. As high PLQY of optimized CsPbBr 3 @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 (QD S). • The fluorescence lifetime and PLQY of CsPbBr 3 @10% Kaolin are 39.63 ns and 95.56% (a considerably higher than pure CsPbBr 3) respectively. • The designed CsPbBr 3 @10% Kaolin shows more superior stability than pure CsPbBr 3 QD S under exposing water, heat, and UV light irradiation such as after 40 days of immersion in water, the emission intensity of CsPbBr 3 @10% Kaolin is basically unchanged, the CsPbBr 3 @10% Kaolin maintains 79% of its PL intensity at 100° C and so on. • The as-prepared CsPbBr 3 @10% Kaolin composites are employed to construct a white LED device. [ABSTRACT FROM AUTHOR]