He Kun, Shen Cong, Zhu Yanqing, Chen Xiaoli, Bi Zhuoneng, Marimuthu Thandapani, Xu Gang, Xu Xueqing
Guangzhou Institute of Energy Conversion, Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Chinese Academy of Sciences, Guangzhou 510640, P R China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P R China.
Langmuir. 2020 Sep 1;36(34):10210-10217. doi: 10.1021/acs.langmuir.0c01688. Epub 2020 Aug 19.
Perovskite nanomaterials have been fascinating for commercial applications and fundamental research owing to their excellent optical properties and satisfactory processability. They are expected to be alternative downconversion materials in phosphor-converted LEDs for lighting or display technology. However, owing to their low formation energy and large specific surface area, perovskite nanomaterials are sensitive to environmental stress like humidity, heat, etc. In this paper, cubic CsPbI quantum dots (QDs) with improved stability are synthesized using (3-aminopropyl)triethoxysilane (APTES). These luminescent CsPbI QDs passivated by APTES not only show excellent stability when stored in hexane but also possess outstanding steadiness for lattice structure when prepared as a thin film in open air. They do not decompose immediately in the water. Such excellent stability is attributed to the hindrance from hydrolysis of APTES, which forms an analogous core-shell structure to protect the "core" CsPbI QDs. Furthermore, an additional iodine source is added to enhance their emissionm and CsPbIQDs with a PLQY of 84% are synthesized.
钙钛矿纳米材料因其优异的光学性能和良好的加工性能，在商业应用和基础研究方面备受关注。它们有望成为用于照明或显示技术的磷光转换发光二极管中的替代下转换材料。然而，由于其形成能低和比表面积大，钙钛矿纳米材料对湿度、热等环境应力敏感。本文使用（3-氨丙基）三乙氧基硅烷（APTES）合成了具有更高稳定性的立方相CsPbI量子点（QDs）。这些经APTES钝化的发光CsPbI量子点不仅在己烷中储存时表现出优异的稳定性，而且在空气中制备成薄膜时，其晶格结构也具有出色的稳定性。它们不会在水中立即分解。这种优异的稳定性归因于APTES水解的阻碍，APTES形成了类似核壳结构来保护“核”CsPbI量子点。此外，添加额外的碘源以增强其发光，合成了光致发光量子产率为84%的CsPbI量子点。
