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

Author:

Guo Heng1,Shi Linlin2,Shi Zengliang3,He Yue4,Zhu Yizhi2ORCID

Affiliation:

1. Department of Science Taiyuan Institute of Technology Taiyuan People's Republic of China

2. College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan People's Republic of China

3. State Key Laboratory of Digital Medical Engineering School of Electronic Science and Engineering Southeast University Nanjing Jiangsu People's Republic of China

4. Microcellular Plastics Manufacturing Laboratory Department of Mechanical and Industrial Engineering University of Toronto Toronto Ontario Canada

Abstract

AbstractYellow 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 are made 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 spectra may 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.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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