Zhang Hongyue, Wang Bolun, Niu Zijian, Chen Guangrui, Guan Buyuan, Li Jiyang, Yu Jihong
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
International Center of Future Science, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China.
Mater Horiz. 2023 Oct 30;10(11):5079-5086. doi: 10.1039/d3mh01092a.
Ultrasmall CsPbBr perovskite quantum dots (PQDs) as promising blue-emitting materials are highly desired for full-color display and lighting applications, but their inferior efficiency and poor ambient stability hinder extensive applications. Herein, a "break-and-repair" strategy has been developed to tightly confine monodispersed ultrasmall CsPbBr PQDs in a zeolite. In this strategy, the CsPbBr PQDs are introduced into the zeolite a high temperature evaporation method, wherein the perovskite precursors break the zeolite framework, and amino acids and silane are then used to fix the damaged framework and lock the perovskite QDs within the matrix. By modulating the synthetic conditions to control the growth of CsPbBr, PQDs with ultrasmall size of 2 nm have been obtained in the zeolite, giving emission centered at 460 nm with a high quantum yield of 76.93%. Strikingly, the PQDs@zeolite composite exhibits water-induced reversible photoluminescence promoted by the coordination between the amino acids and PQDs in a dynamic manner, achieving enhanced water stability (14 days in aqueous solution). This work provides a new perspective for the synthesis of water-stable blue-emitting perovskite composites for potential applications in lighting fields.
超小的CsPbBr钙钛矿量子点（PQDs）作为有前景的蓝光发射材料，在全彩显示和照明应用中备受期待，但其效率低下和环境稳定性差阻碍了其广泛应用。在此，已开发出一种“断裂-修复”策略，将单分散的超小CsPbBr PQDs紧密限制在沸石中。在该策略中，通过高温蒸发法将CsPbBr PQDs引入沸石，其中钙钛矿前驱体破坏沸石骨架，然后使用氨基酸和硅烷修复受损骨架并将钙钛矿量子点锁定在基质内。通过调节合成条件来控制CsPbBr的生长，在沸石中获得了尺寸为2 nm的超小PQDs，发射峰位于460 nm，量子产率高达76.93%。引人注目的是，PQDs@沸石复合材料表现出由氨基酸和PQDs之间的动态配位促进的水诱导可逆光致发光，实现了增强的水稳定性（在水溶液中14天）。这项工作为合成用于照明领域潜在应用的水稳定蓝光发射钙钛矿复合材料提供了新的视角。
