Photo-stability of CsPbBr₃ perovskite quantum dots for optoelectronic application

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• 作者：Junsheng Chen 陈俊生 ; Dongzhou Liu 刘东州 ; Mohammed J. Al-Marri…
• 关键词：perovskite ; quantum dots ; photo ; stability
• 刊名：Science China Materials
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：59
• 期：9
• 页码：719-727
• 全文大小：2,927 KB
• 刊物类别：Materials Science, general; Chemistry/Food Science, general;
• 刊物主题：Materials Science, general; Chemistry/Food Science, general;
• 出版者：Science China Press
• ISSN：2199-4501
• 卷排序：59

文摘

Due to their superior photoluminescence (PL) quantum yield (QY) and tunable optical band gap, all-inorganic CsPbBr₃ perovskite quantum dots (QDs) have attracted intensive attention for the application in solar cells, light emitting diodes (LED), photodetectors and laser devices. In this scenario, the stability of such materials becomes a critical factor to be revealed. We hereby investigated the long-termstability of as-synthesized CsPbBr₃ QDs suspended in toluene at various environmental conditions. We found light illumination would induce drastic photo-degradation of CsPbBr₃QDs. The steady-state spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD) verified that CsPbBr₃ QDs tend to aggregate to form larger particles under continuous light soaking. In addition, decreasing PL QY of the QDs during light soaking indicates the formation of trap sites. Our work reveals that the main origin of instability in CsPbBr₃ QDs and provides reference to engineer such QDs towards optimal device application.