通过化学计量前驱体一锅法合成全无机 CsPbClBr2 蓝色钙钛矿量子点,Inorganic Chemistry

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通过化学计量前驱体一锅法合成全无机 CsPbClBr2 蓝色钙钛矿量子点
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2023-07-10 , DOI: 10.1021/acs.inorgchem.3c01486
Jin Young Kim ₁ , Woongsik Jang ₁ , Jihyun Lim ₁ , Dong Hwan Wang ₁

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钙钛矿基蓝光发射粒子的合成对于多种应用具有重要价值，因为可以利用与多激子产生相关的构成材料的优异光学性质和性能。然而，钙钛矿前驱体的制备需要高温，导致制造过程复杂。本文提出了一种一锅法合成CsPbClBr ₂蓝光量子点（QD）的方法。在非化学计量前体合成的情况下，CsPbClBr ₂ QD 与其他产物共存。通过以不同比例混合二甲基甲酰胺（DMF）和/或二甲基亚砜（DMSO）来选择合成混合钙钛矿纳米粒子（含氯化物）的溶剂。当仅使用DMF以及化学计量的CsBr和PbX ₂ (X=Cl,Br)比例时，量子产率为70.55%，并且实现了优异的光学性能。此外，400小时内未观察到变色，并保持高光致发光强度。当加入去离子水与己烷形成双层时，发光保持15天。换句话说，钙钛矿即使与水接触也不易分解，这抑制了结构中重金属原子Pb ^{2+的释放。}总的来说，所提出的全无机钙钛矿量子点的一锅法为合成优质蓝光材料提供了一个平台。

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One-Pot Synthesis of All-Inorganic CsPbClBr2 Blue Perovskite Quantum Dots via Stoichiometric Precursor

The synthesis of perovskite-based blue light-emitting particles is valuable for several applications as the excellent optical properties and performances of the constituting materials associated with multi-exciton generation can be exploited. However, the preparation of perovskite precursors requires high temperatures, resulting in a complex manufacturing process. This paper proposes a one-pot method to synthesize CsPbClBr₂ blue light-emitting quantum dots (QDs). In the case of nonstoichiometric precursor synthesis, the CsPbClBr₂ QDs coexisted with additional products. The solvent for synthesizing mixed perovskite nanoparticles (containing chloride) was selected by mixing dimethylformamide (DMF) and/or dimethyl sulfoxide (DMSO) in different ratios. When only DMF was used with the stoichiometric CsBr and PbX₂ (X = Cl, Br) ratio, the quantum yield was 70.55%, and superior optical properties were achieved. Moreover, no discoloration was observed for 400 h, and a high photoluminescence intensity was maintained. When deionized water was added to form a double layer with hexane, the luminescence was maintained for 15 days. In other words, the perovskite did not easily decompose even when in contact with water, which suppressed the release of Pb²⁺, which are heavy metal atoms in the structure. Overall, the proposed one-pot method for all-inorganic-based perovskite QDs provides a platform for synthesizing superior blue light-emitting materials.

更新日期：2023-07-10

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