Hot Paper - 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

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Dongdong Yan 鄢冬冬 ¹, Shuangyi Zhao 赵双易 ¹, Yubo Zhang 张玉波 ², Huaxin Wang 王华昕 ¹, Zhigang Zang 臧志刚 ¹

¹ Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
中国重庆重庆大学光电技术及系统教育部重点实验室
² Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
中国深圳南方科技大学物理系

https://doi.org/10.29026/oea.2022.200075

https://www.oejournal.org/article/doi/10.29026/oea.2022.200075

Opto-Electronic Advances, 25 January 2022

Abstract

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.

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