Multi-stimulated far-UVC luminescence for solar-blind imaging

Chongyang Cai, Leipeng Li (), Xiaohuan Lv, Huimin Li, Tao Li, Pei Li, Wenting Zhao, Lingzhu Zi, Shiji Feng, Xuan Fan, Hailei Zhang, Dengfeng Peng (), Feng Wang (), Jianrong Qiu and Yanmin Yang ()
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Chongyang Cai: Hebei University
Leipeng Li: Hebei University
Xiaohuan Lv: Hebei University
Huimin Li: Hebei University
Tao Li: Hebei University
Pei Li: Hebei University
Wenting Zhao: Hebei University
Lingzhu Zi: Hebei University
Shiji Feng: Hebei University
Xuan Fan: Hebei University
Hailei Zhang: Hebei University
Dengfeng Peng: Shenzhen University
Feng Wang: City University of Hong Kong
Jianrong Qiu: Zhejiang University
Yanmin Yang: Hebei University

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Lanthanides-doped luminescent materials have gathered considerable attention due to their application potential in stress sensing, lighting and display, anti-counterfeiting technology and so forth. However, existing materials mainly cover the 380–1540 nm range, with slight extension to the UV region, impeding their applications in solar-blind imaging, background-free tracking, concealed communication, etc. To address this challenge, here we propose guidelines for far-UVC (200–230 nm) optical design. Accordingly, we achieve multi-stimulated far-UVC luminescence at ~222 nm in Pr3+-doped SrF2, stemming from the inter-configurational 4f5d → 4f 2 transition of Pr3+. Besides Pr3+, the SrF2 host shows high tolerance to Ce3+, Nd3+, Sm3+, Eu2+,3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+ and Yb3+, vastly extending the emission wavelength across the entire spectral range from 200 to 1700 nm. Particularly, these materials exhibit self-recoverable mechanoluminescence by direct mechanical excitation, along with thermally and mechanically stimulated emission after X-ray irradiation. We demonstrate that these lanthanides-doped SrF2 crystals offer unique opportunities for high-contrast marking and structural health monitoring in complex environments.

Date: 2025
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DOI: 10.1038/s41467-025-61522-6

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