Highly Stable Lead-Free Perovskite Single Crystals with NIR Emission Beyond 1100 nm

Zhuang Liu, Xian Qin, Qihao Chen, Qiushui Chen, Yuhang Jing, Zhonghao Zhou, Yong Sheng Zhao, Jingsheng Chen, Xiaogang Liu

Research output: Contribution to journalArticlepeer-review

Abstract

Materials that emit in the near-infrared (NIR) region are at the forefront of both research and industry, mainly due to their wide applications in national security, nondestructive bioimaging, long-wave communications, and photothermal conversion for medical care. As a key member of the luminescent materials family, metal halide perovskites have been intensively demonstrated to emit light in ultraviolet and visible regions. However, NIR-emitting perovskites suffer from severe limitations, such as low photoluminescence quantum yield and poor chemical/optical stability, thereby preventing them from practical applications. Herein, the synthesis and growth of Cs2MoCl6 and Cs2WCl6 perovskite single crystals with ultrahigh chemical and optical resistance to heat, moisture, polar solvents, and high-energy radiation is reported. Upon ultraviolet or blue excitation, these lead-free single crystals emit light beyond 1100 nm, the longest wavelength ever reported for perovskite hosts. Mechanistic studies indicate that self-trapped excitons are responsible for the NIR emission. The authors fabricate optoelectronic devices using these single crystals and demonstrate their broad applications in noninvasive palm vein imaging, night vision, and nondestructive food analysis. These results may stimulate research in the development of high-efficiency NIR perovskite phosphors for fast, accurate biometric identification and food inspection.
Original languageEnglish (US)
Pages (from-to)2201254
JournalAdvanced Optical Materials
DOIs
StatePublished - Aug 4 2022
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-09-14
Acknowledged KAUST grant number(s): OSR-2018-CRG7-3736
Acknowledgements: The authors thank the Agency for Science, Technology and Research (A*STAR) under its AME program (Grant NO. A1983c0038), the National Research Foundation, the Prime Minister's Office of Singapore under its Competitive Research Program (CRP Award No. NRF-CRP23-2019-0002) and NRF Investigatorship Programme (Award No. NRF-NRFI05-2019-0003), and the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2018-CRG7-3736.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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