Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China.
Chengdu Product Quality Supervision, Inspection and Research Institute, Chengdu 610100, China.
ACS Appl Mater Interfaces. 2023 May 24;15(20):24622-24628. doi: 10.1021/acsami.3c03506. Epub 2023 May 12.
Inorganic perovskites CsPbX (X = Cl, Br, I) have shown great potential as luminescent materials for a wide range of photoelectric devices. However, the practical use of these materials is limited due to the toxicity of lead and poor stability. Here, we present a facile low-temperature, solution-based method to synthesize lead-free and highly stable CsCuBr single crystals (SCs) without the use of organic solvents. Owing to the self-trapped exciton emissions, CsCuBr SCs exhibit a strong broadband blue emission with a high photoluminescence quantum yield (PLQY) upon 254 nm ultraviolet light excitation. In addition, the CsCuBr SCs show a high stability against heat, humidity, and UV light. Therefore, the CsCuBr SCs are utilized as emitters in white light emitting diodes (WLEDs), demonstrating a high color rendering index of 81 and a decent commission internationale de l'Eclairage coordinate of (0.30, 0.34). Furthermore, the prepared WLEDs are used in wireless visible light communications, showing a -3 dB bandwidth of 6.7 MHz and an achievable data rate of 45 Mbps. Our study provides a novel organic-solvent-free, low-temperature method to synthesize CsCuBr SCs and could promote the development of Cu-based metal halides in visible light communications.
无机钙钛矿 CsPbX（X=Cl、Br、I）作为光电设备的发光材料具有很大的应用潜力。然而，由于铅的毒性和较差的稳定性，这些材料的实际应用受到限制。在这里，我们提出了一种简便的低温、基于溶液的方法，无需使用有机溶剂即可合成无铅且高度稳定的 CsCuBr 单晶（SCs）。由于自陷激子发射，CsCuBr SCs 在 254nm 紫外光激发下表现出强的宽带蓝色发射，具有高的光致发光量子产率（PLQY）。此外，CsCuBr SCs 对热、湿度和紫外光具有高稳定性。因此，CsCuBr SCs 被用作白光发光二极管（WLED）的发射器，显示出高显色指数为 81 和良好的国际照明委员会坐标（0.30，0.34）。此外，所制备的 WLED 用于无线可见光通信，显示出-3dB 带宽为 6.7MHz 和可实现的数据速率为 45Mbps。我们的研究提供了一种新的无有机溶剂、低温方法来合成 CsCuBr SCs，并可能促进基于 Cu 的金属卤化物在可见光通信中的发展。
