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Stable Luminescent CsPbI3 Quantum Dots Passivated by (3-Aminopropyl)triethoxysilane.
Langmuir ( IF 3.7 ) Pub Date : 2020-08-04 , DOI: 10.1021/acs.langmuir.0c01688
Kun He 1, 2 , Cong Shen 1, 2 , Yanqing Zhu 1 , Xiaoli Chen 1 , Zhuoneng Bi 1, 2 , Thandapani Marimuthu 1 , Gang Xu 1 , Xueqing Xu 1, 2
Affiliation  

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 CsPbI3 quantum dots (QDs) with improved stability are synthesized using (3-aminopropyl)triethoxysilane (APTES). These luminescent CsPbI3 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” CsPbI3 QDs. Furthermore, an additional iodine source is added to enhance their emissionm and CsPbI3QDs with a PLQY of 84% are synthesized.

中文翻译:

(3-氨基丙基)三乙氧基硅烷钝化的稳定发光CsPbI3量子点。

钙钛矿纳米材料因其出色的光学性能和令人满意的加工性能而一直吸引着商业应用和基础研究。预计它们将成为荧光粉转换LED中用于照明或显示技术的替代下转换材料。然而,由于钙钛矿纳米材料的形成能低,比表面积大,因此对诸如湿气,热等环境应力敏感。在本文中,使用(3-氨基丙基)合成了具有改善稳定性的立方CsPbI 3量子点三乙氧基硅烷(APTES)。这些发光的CsPbI 3APTES钝化的量子点不仅在己烷中存储时表现出出色的稳定性,而且在露天条件下制成薄膜时,其晶格结构也具有出色的稳定性。它们不会立即在水中分解。如此出色的稳定性归因于APTES水解的阻碍,后者形成了类似的核-壳结构以保护“核” CsPbI 3 QD。此外,添加了额外的碘源以提高其发射率,并合成了PLQY为84%的CsPbI 3 QD。
更新日期:2020-09-01
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