期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202105316
关键词
metal halides; near-infrared emission; photoluminescence; Sb; (3+) doping
类别
资金
- National Natural Science Foundation of China [51961145101, 51972118]
- International Cooperation Project of National Key Research and Development Program of China [2021YFE0105700]
- Guangzhou Science & Technology Project [202007020005]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]
The study presents a novel method to achieve high-efficiency broadband NIR emission in metal halide systems by incorporating Sb3+ into the Cs2ZnCl4 matrix. It successfully demonstrates the development of a lead-free metal halide Cs2ZnCl4:Sb3+ as a NIR light source, with the potential for red-shifting emission peaks through halide substitution.
Luminescent metal halide materials with flexible crystallography/electronic structures and tunable emission have demonstrated broad application prospects in the visible light region. However, designing near-infrared (NIR) light-emitting metal halides remains a challenge. Here, an enlightening prototype is proposed to explore the high-efficiency broadband NIR emission in metal halide systems by incorporating Sb3+ into the Cs2ZnCl4 matrix. Combined experimental analysis and density functional theory calculations reveal a modified self-trapped excitons model to elaborate the NIR emission. The high photoluminescence quantum yield of 69.9% peaking at 745 nm and large full width at half maximum of 175 nm, along with excellent air/thermal stability, show the unique advantages of lead-free metal halide Cs2ZnCl4:Sb3+ as the NIR light source. The substitution of Cl- by Br- further enables the red-shift of emission peak from 745 to 823 nm. The NIR light-emitting diode device based on Cs2ZnCl4:Sb3+ demonstrates potential as a non-visible light source in night vision. This study puts forward an effective strategy to design the novel eco-friendly and high-efficiency NIR emissive materials and provides guidance for expanding the application scope of luminescent metal halides.
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