Highly efficient emission and high-CRI warm white light-emitting diodes from ligand-modified CsPbBr3 quantum dots
Highly efficient emission and high-CRI warm white light-emitting diodes from ligand-modified CsPbBr3 quantum dots
复制标题
由配体修饰的 CsPbBr3 量子点制成的高效发射和高 CRI 暖白光发光二极管
DOI：
10.29026/oea.2022.200075
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发表时间：
2022-01-01
影响因子：
14.1
通讯作者：
Zang, Zhigang
中科院分区：
文献类型：
--
作者：
Yan, Dongdong;Zhao, Shuangyi;Zang, Zhigang
全无机CsPbBr 3钙钛矿量子点由于其优异的发光性能在白色发光领域受到了广泛的关注。然而，它们的实际应用受到稳定性差的阻碍。在此，我们提出了一个简单的策略，合成优异的稳定性和有效的发射CsPbBr 3量子点，通过使用2-己基癸酸（DA）作为配体，以取代常规的油酸（OA）配体。由于DA配体与量子点之间的强结合能，修饰后的量子点不仅表现出高达96%的光致发光量子产率（PLQY），而且表现出对乙醇和水的高稳定性。通过将配体修饰的CsPbBr 3量子点与红色AgInZnS量子点结合在蓝色发光InGaN芯片上，构建了暖白色发光二极管（WLED），其显色指数为93，功率效率为64.8 lm/W，CIE坐标为（0.44，0.42），相关色温值为3018 K。此外，基于配体修饰的CsPbBr 3量子点的WLED也比基于常规CsPbBr 3量子点的WLED表现出更好的热性能。改进的效率和更好的热稳定性与高颜色质量的组合表明改性的CsPbBr 3 QD对于WLED应用是理想的。
All-inorganic CsPbBr3 perovskite quantum dots (QDs) have received great attention in white light emission because of their outstanding properties. However, their practical application is hindered by poor stability. Herein, we propose a simple strategy to synthesize excellent stability and efficient emission of CsPbBr3 QDs by using 2-hexyldecanoic acid (DA) as a ligand to replace the regular oleic acid (OA) ligand. Thanks to the strong binding energy between DA ligand and QDs, the modified QDs not only show a high photoluminescence quantum yield (PLQY) of 96% but also exhibit high stability against ethanol and water. Thereby warm white light-emitting diodes (WLEDs) are constructed by combining ligand modified CsPbBr3 QDs with red AgInZnS QDs on blue emitting InGaN chips, exhibiting a color rendering index of 93, a power efficiency of 64.8 lm/W, a CIE coordinate of (0.44, 0.42) and correlated color temperature value of 3018 K. In addition, WLEDs based on ligand modified CsPbBr3 QDs also exhibit better thermal performance than that of WLEDs based on the regular CsPbBr3 QDs. The combination of improved efficiency and better thermal stability with high color quality indicates that the modified CsPbBr3 QDs are ideal for WLEDs application.