Revealing Atomic-Level Surface Passivation of PbI2-Reconditioned Red Perovskite Quantum Dots,Advanced Optical Materials

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Revealing Atomic-Level Surface Passivation of PbI2-Reconditioned Red Perovskite Quantum Dots
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-01-09 , DOI: 10.1002/adom.202202561
Liuli Yang ₁ , Jianhua Huang ₁ , Zheyuan Xu ₁ , Yang Li ₁ , Shijin Hou ₁ , Yike Tan ₁ , Juan Du _{2,

3} , Xiao Wang ₁ , Ziwei Li ₁ , Anlian Pan ₁

Affiliation

CsPbI₃ perovskite quantum dots (QDs) are promising materials for high-efficiency and low-cost red fluorophores in advanced display and light-sensing applications. However, structural and spectral stabilities of CsPbI₃ QDs by traditional preparation are seriously broken in water or light environment. Here, a compositional engineering strategy with an additional PbI₂-recondition process to synthesize highly-stable CsPbBr_1.2I_1.8 @ SiO₂ QDs is demonstrated. Time- and temperature-dependent photoluminescence and Raman measurements prove that spectral stability and exciton binding energy of QDs are greatly improved within this strategy. Notably, high-resolution structure characterizations, point-to-point diffraction patterns and line-scanning of element distributions provide strong and direct evidence at atomic-level to reveal that PbI₂-recondition can repair defects well, which helps to construct perfect lattices and homogeneous SiO₂ passivation layers to prevent the surface bonding of molecules. Moreover, our red perovskite QDs are further designed to prepare various anti-counterfeiting labels as multi-scale complex patterns to store and protect information. The proposed recondition strategy explores a new avenue to prepare stable and high-quality red perovskite QDs for new-generation lighting and light-sensing devices.

中文翻译：

揭示 PbI2 修复的红色钙钛矿量子点的原子级表面钝化

CsPbI ₃钙钛矿量子点 (QD) 是一种很有前途的材料，可用于高级显示和光传感应用中的高效低成本红色荧光团。然而，传统方法制备的CsPbI ₃量子点的结构和光谱稳定性在水或光环境中严重受损。在这里，一种成分工程策略与额外的 PbI ₂ -修复过程合成高度稳定的 CsPbBr _1.2 I _1.8 @ SiO ₂量子点被证明。时间和温度相关的光致发光和拉曼测量证明，在该策略下，QD 的光谱稳定性和激子结合能得到了极大的改善。值得注意的是，高分辨率的结构表征、点对点衍射图案和元素分布的线扫描提供了原子级强有力和直接的证据，表明 PbI 2 -修复可以很好地修复缺陷，这有助于构建完美的_晶格和均相 SiO ₂钝化层以防止分子的表面结合。此外，我们的红色钙钛矿量子点进一步设计用于制备各种防伪标签作为多尺度复杂图案来存储和保护信息。所提出的修复策略探索了为新一代照明和光敏设备制备稳定和高质量红色钙钛矿量子点的新途径。

更新日期：2023-01-09

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