Enhancing the Stability of CH3NH3PbBr3Quantum Dots by Embedding in Silica Spheres Derived from Tetramethyl Orthosilicate in “Waterless” Toluene,Journal of the American Chemical Society

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Enhancing the Stability of CH3NH3PbBr3Quantum Dots by Embedding in Silica Spheres Derived from Tetramethyl Orthosilicate in “Waterless” Toluene
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2016-05-02 , DOI: 10.1021/jacs.5b13101
Shouqiang Huang ₁ , Zhichun Li ₁ , Long Kong ₁ , Nanwen Zhu ₁ , Aidang Shan ₁ , Liang Li ₁

Affiliation

Methylammonium lead halide perovskites suffer from poor stability because of their high sensitivity to moisture. Inorganic material coatings of SiO2 are preferred for coupling with perovskites to improve their stability, whereas the conventional SiO2 formation method is unsuitable because it requires water. Here, a simple SiO2 generation method based on the high hydrolysis rate of tetramethyl orthosilicate in analytical-grade toluene was developed to avoid the addition of water and catalyst. As a result, SiO2-encapsulated CH3NH3PbBr3 quantum dots (MAPB-QDs/SiO2) were fabricated without decreasing the quantum yield. Photostability tests indicated that the MAPB-QDs/SiO2 samples were markedly more stable than the unencapsulated MAPB-QDs. The photoluminescence (PL) of the MAPB-QDs/SiO2 powders was maintained at 94.10% after 470 nm LED illumination for 7 h, which was much higher than the remnant PL (38.36%) of the pure MAPB-QD sample under a relative humidity of 60%. Similar test results were observed when the MAPB-QDs/SiO2 powders were incorporated into the poly(methyl methacrylate) films. The enhanced photostability is ascribed to the SiO2 barriers protecting the MAPB-QDs from degradation.

中文翻译：

通过嵌入由“无水”甲苯中的原硅酸四甲酯衍生的二氧化硅球体来增强 CH3NH3PbBr3 量子点的稳定性

甲基铵卤化铅钙钛矿由于对水分高度敏感，因此稳定性差。SiO2 无机材料涂层优选用于与钙钛矿偶联以提高其稳定性，而传统的 SiO2 形成方法不适合，因为它需要水。在这里，基于原硅酸四甲酯在分析级甲苯中的高水解率，开发了一种简单的 SiO2 生成方法，以避免添加水和催化剂。结果，在不降低量子产率的情况下制造了 SiO2 封装的 CH3NH3PbBr3 量子点（MAPB-QDs/SiO2）。光稳定性测试表明，MAPB-QDs/SiO2 样品明显比未封装的 MAPB-QDs 更稳定。MAPB-QDs/SiO2 粉末的光致发光 (PL) 保持在 94。470 nm LED 照射 7 小时后的 10%，远高于 60% 相对湿度下纯 MAPB-QD 样品的残余 PL (38.36%)。当将 MAPB-QDs/SiO2 粉末掺入聚（甲基丙烯酸甲酯）薄膜时，观察到类似的测试结果。增强的光稳定性归因于保护 MAPB-QD 免受降解的 SiO2 屏障。

更新日期：2016-05-02

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