As a new type of colloidal nanocrystals, perovskite quantum dots (QDs) have received widespread attention. Water and oxygen in the air can affect the luminous efficiency of quantum dots, which can degrade the surface of QDs and affect their luminescence efficiency. Herein we discuss the synthesis of high-quality QDs using an uncomplicated coating method by which an ultrathin epitaxial Al self-passivation layer bearing homogeneous ligands can be coated on the QDs. The core/shell perovskite QDs maintain high luminescence efficiency and photostability. The CsPbBr3/2ZnS/Al QDs were only attenuated by 10% after 14 h of exposure to LED light. The temperature-dependent photoluminescence properties of the all-inorganic perovskite QDs, such as the PL intensity, emission peak position, and the full width at half maximum (FWHM), were investigated. The results indicated that the activation energy of QDs increases with the increase of the number of ZnS shell layers, its stability increases significantly. The introduction of Al does not change the luminescence mechanism of QDs. Finally, we have made flexible light-emitting device with CsPbBr3/2ZnS/Al QDs.

中文翻译：

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具有铝自钝化功能的高稳定性钙钛矿 CsPbBr3/nZnS/Al 核/多壳量子点的外延生长

作为一种新型的胶体纳米晶体，钙钛矿量子点（QDs）受到了广泛的关注。空气中的水和氧气会影响量子点的发光效率，使量子点表面退化，影响其发光效率。在这里，我们讨论了使用简单的涂层方法合成高质量 QD，通过该方法可以在 QD 上涂覆带有均匀配体的超薄外延铝自钝化层。核/壳钙钛矿量子点保持高发光效率和光稳定性。CsPbBr3/2ZnS/Al QDs 在暴露于 LED 光 14 小时后仅衰减 10%。研究了全无机钙钛矿 QD 的温度依赖性光致发光特性，例如 PL 强度、发射峰位置和半峰全宽 (FWHM)。结果表明，QDs的活化能随着ZnS壳层数的增加而增加，其稳定性显着增加。Al 的引入不会改变 QD 的发光机制。最后，我们用 CsPbBr3/2ZnS/Al QDs 制作了柔性发光器件。