DataVXAdvanced Optical MaterialsPaper
journal article·2025-09Open access

High‐Temperature Negative‐Thermal‐Quenching in Broadband NIR Light‐Emitting ScF3:Cr3+ Phosphors

Yongjie Wang, Yingju Yan, Dongshuo Li, Qingzhou Bu, Guotao Xiang, Li Li, Sha Jiang, Xianju Zhou, Qilong Gao, Yaroslav Zhydachevskyy, Mikhail G. Brik, Andrzej Suchocki

Advanced Optical Materials· Volume 13· Issue 27
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Abstract

Abstract Broadband near‐infrared (NIR) phosphors with superior thermal stability are critical enablers of high‐power NIR pc‐LEDs, emerging as essential light sources for NIR spectroscopy applications. In this work, an unprecedented high‐temperature negative thermal quenching (NTQ) phenomenon persisting up to 500 K is reported in Cr3+‐activated ScF3 phosphors, which emit broadband NIR emission in the 700–1200 nm (λem = 850 nm, FWHM = 132 nm). The theoretical calculations employing the Exchange‐Charge Model (EMC) for crystal field parameters of Cr3+ ions in [ScF6] octahedral sites remain in perfect agreement with the experimental results. Critically, Yb3+‐codoping enables efficient Cr3+ → Yb3+ energy transfer, achieving substantial spectral broadening (FWHM = 254 nm) and significantly enhanced thermal stability. The temperature‐dependent X‐ray diffraction (XRD) and theoretical calculations reveal that anisotropic F‐atom vibrations drive negative thermal expansion (NTE) in cubic ScF3, distorting [ScF6] octahedra. It is demonstrated that synergistic electron‐phonon coupling and NTE‐driven structural dynamics underpin the superior thermal stability of NIR emission. These findings establish a design paradigm for new broadband NIR phosphors with outstanding thermal stability for next‐generation high‐power NIR pc‐LED applications.
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Research context

OpenAlex topics: Luminescence Properties of Advanced Materials · Optical properties and cooling technologies in crystalline materials · Solid State Laser Technologies

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Affiliations

Chongqing Key Laboratory of Photoelectronic Information Sensing and Microsystems School of Electronic Science and Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 China

International Laboratory for Quantum Functional Materials of Henan School of Physics and Microelectronics Zhengzhou University Zhengzhou 450001 China

Institute of Physics Polish Academy of Sciences Al. Lotników 32/46 Warsaw 02‐668 Poland

School of Integrated Circuits Chongqing University of Posts and Telecommunications Chongqing 400065 China

Centre of Excellence for Photoconversion Vinča Institute of Nuclear Sciences ‐ National Institute of the Republic of Serbia University of Belgrade Belgrade 11351 Serbia

Institute of Physics University of Tartu W. Ostwald Str. 1 Tartu 50411 Estonia

Faculty of Science and Technology Jan Długosz University Armii Krajowej 13/15 Częstochowa 42‐200 Poland

Academy of Romanian Scientists 3 Ilfov Bucharest 050044 Romania

Funding

Venture and Innovation Support Program for Chongqing Overseas Returnees · Natural Science Foundation of Chongqing Municipality · Chongqing Municipal Science and Technology Bureau

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