Direct synthesis of high quantum yield lead-free CsCu2I3 powder in water and its application in yellow LED

Heng Guo; Linlin Shi; Zengliang Shi; Yue He; Yizhi Zhu

doi:10.1002/EXP.20240004

Exploration ›› 2025, Vol. 5 ›› Issue (1) : 20240004 DOI: 10.1002/EXP.20240004

RESEARCH ARTICLE

Direct synthesis of high quantum yield lead-free CsCu₂I₃ powder in water and its application in yellow LED

Heng Guo ¹^,^†
, Linlin Shi ²
, Zengliang Shi ³^,^†
, Yue He ⁴
, Yizhi Zhu ²^,^†

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Abstract

Yellow light-emitting diodes (LEDs) with a wavelength of 570–590 nm can reduce the excitability of peripheral nerves and the sensitivity of the skin, stimulate collagen synthesis, and tighten the skin, which plays an important role in skin rejuvenation. In general, commercial LEDs aremade of phosphor excited by ultraviolet chips. It is very important for the development of yellow light emitters with high luminous efficiency, good stability, and environmental protection. For the first time, a simple organic structural unit (2-methylimidazole, 2-MIM) was used to collect a mixture of two metal precursors (CsI and CuI) and successfully synthesized an all-inorganic lead-free yellow light CsCu2I3 powder in water. The prepared CsCu₂I₃ powder exhibited excellent optical properties and considerable stability. Finally, a phosphor-converted LED (pc-LED) device was fabricated via the CsCu₂I₃ phosphor coated on a 310 nm ultraviolet chip. The pc-LED device’s electroluminescence spectramay be a good fit for the blood’s absorption regions. Therefore, this work provides a facile method for the synthesis of novel lead-free metal halide CsCu₂I₃ powder in eco-friendly solvents. In addition, the stable and efficient CsCu₂I₃ powder shows promising exciting potential applications in photoluminescence and phototherapy fields.

Keywords

2-methylimidazole / CsCu ₂I ₃ / quantumyield / stability

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Heng Guo, Linlin Shi, Zengliang Shi, Yue He, Yizhi Zhu. Direct synthesis of high quantum yield lead-free CsCu₂I₃ powder in water and its application in yellow LED. Exploration, 2025, 5(1): 20240004 DOI:10.1002/EXP.20240004

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