Mechanochemical Synthesis of Phase-Pure CsCu2I3 and Cs3Cu2I5 Phosphors Regulated by Polar Solvents and Their Application in Tunable Chromaticity LEDs

作者：Yichen Zhu, Yubin Kang, Su Jing, Zhi Wen, Mingchun Li, Qiangqiang Zhu, Yue Zhai, Juan Kang, Yanghui Li, Le Wang · 发表于：Inorganic Chemistry · 年份：2025 · DOI：10.1021/acs.inorgchem.4c05039 · 被引用次数：9 · 研究领域：Perovskite Materials and Applications、Luminescence and Fluorescent Materials、Conducting polymers and applications

Lead halide perovskites have garnered interest in light-emitting diode (LED) applications due to their strong emission and tunable properties. However, conventional synthesis methods involve energy-intensive thermal processes and hazardous organic solvents, raising environmental concerns. In this study, we report a simple and eco-friendly mechanochemical approach that produces phase-pure blue-emitting Cs 3 Cu 2 I 5 (emission at 440 nm) and yellow-emitting CsCu 2 I 3 (emission at 570 nm) phosphors through polarity modulation and control of grinding duration. Our comprehensive analysis of the phase transitions during mechanochemical synthesis reveals that pure Cs 3 Cu 2 I 5 was synthesized from a 3:2 precursor molar ratio in ethanol for 30 min, while pure CsCu 2 I 3 was obtained from a 1:2 precursor molar ratio in an aqueous solution for 7.5 min. Moreover, Raman spectroscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy analyses confirmed that phase-pure phosphors were achieved through these methods. Finally, we fabricated a series of color-adjustable LEDs by mixing Cs 3 Cu 2 I 5 and CsCu 2 I 3 phosphors in different proportions. This demonstrates the potential of our mechanochemical synthesis for the efficient, large-scale production of next-generation lighting materials with tunable emission.