Liang Dehai, Sun Zhe, Lu Shirong, Zhao Jinrong, Zhou Yong, An Kang, Zang Zhigang
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China.
Department of Material Science and Technology, Taizhou University, Taizhou 318000, China.
Inorg Chem. 2023 May 15;62(19):7296-7303. doi: 10.1021/acs.inorgchem.3c00352. Epub 2023 May 3.
Lead-free metal halides (LMHs) have recently attracted numerous attention in solid-state lighting due to their unique structures and outstanding optoelectronic properties. However, conventional preparation processes with the utilization of toxic organic solvents and high temperatures seem to impede commercial applications of LMHs. In this work, we successfully synthesize Cu-based metal halides (TMA)CuBrCl (TMA: tetramethylammonium) with high photoluminescence quantum yields (PLQYs) a solvent-free mechanical grinding method. By changing the ratio of halide ions (Cl and Br) in precursors, the emission wavelength of the prepared (TMA)CuBrCl can be tuned from 535 to 587 nm, which are employed as emitters in the fabrication of white-light-emitting diodes (WLEDs). The achieved WLEDs exhibit a high color rendering index value of 84 and standard Commission Internationale de l'Éclairage (CIE) coordinates of (0.324, 0.333). This feasible and solvent-free preparation strategy not only promotes the mass production of LMHs but also highlights the promising potential for efficient solid-state illumination.
无铅金属卤化物（LMHs）因其独特的结构和优异的光电性能，近年来在固态照明领域备受关注。然而，利用有毒有机溶剂和高温的传统制备工艺似乎阻碍了LMHs的商业应用。在这项工作中，我们通过无溶剂机械研磨法成功合成了具有高光致发光量子产率（PLQYs）的铜基金属卤化物（TMA）CuBrCl（TMA：四甲基铵）。通过改变前驱体中卤离子（Cl和Br）的比例，制备的（TMA）CuBrCl的发射波长可在535至587 nm之间调节，这些被用作制造白光发光二极管（WLEDs）的发光体。所制备的WLEDs具有84的高显色指数值和标准国际照明委员会（CIE）坐标（0.324, 0.333）。这种可行的无溶剂制备策略不仅促进了LMHs的大规模生产，还突出了其在高效固态照明方面的广阔前景。
