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Facile synthesis of KaCs1−aPbBr3@ molecular sieve SBA-15 composite with improved luminescence and wet/thermal stability
Colloids and Surfaces A: Physicochemical and Engineering Aspects  (IF5.518),  Pub Date : 2022-05-21, DOI: 10.1016/j.colsurfa.2022.129258
Qizheng Dong, Binglong Tian, Wenbo Zhang, Ling He

CsPbX3 (Xdouble bondCl, Br, I) perovskite quantum dots (PeQDs) have excellent properties, which makes it the most promising optoelectronic materials for the next generation of light-emitting diodes (LEDs) and display devices fields. However, CsPbX3 PeQDs have poor-term stability and easily decompose in moist or heat conditions. In this paper, the KaCs1−aPbBr3 @SBA-15 composite was prepared at room temperature. Alkali metal ion doping can enhance the luminous intensity and tune the emission spectrum of CsPbBr3 PeQDs, while the introduction of the SBA-15 matrix improves the stability of the KaCs1−aPbBr3 PeQDs (a=0, 0.1, 0.25, 0.35, 0.4, 0.45). When the molar ratio of K+/Cs+ is 0.4 / 0.6, the PL intensity of CsPbBr3 PeQDs increased by 21.4%. The luminous intensity of K0.4Cs0.6PbBr3 @SBA-15 composite is further increased by 18.8% compared to the K0.4Cs0.6PbBr3 PeQDs, and its moisture and heat resistance are significantly improved. The PL intensity of K0.4Cs0 6PbBr3 @SBA-15 can maintain 52% of the initial brightness after immersion in deionized water for 21 days, as well as reaching 95% of the initial value in the heating/cooling cycle treatment. Such excellent properties make the KaCs1−aPbBr3 @SBA-15 composite an ideal material for lighting and display applications.