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Research Article | Open Access

Self-reduction-induced Mn heterovalent coexistence for Vis–NIR dual-emission

Yujia Wang1, Xin Pan2( ), Zunqi Liu3( ), Zhaojie Wu1, Yiren Xiao1, Ke Su4, Yinghua Rao5, Yuanhao Jian1, Qingfeng Guo5, Libing Liao1, Lefu Mei1,3( )
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, Hebei Key Laboratory of Resource Low-carbon Utilization and New Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Chemistry and Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China
School of Science, China University of Geosciences Beijing, Beijing 100083, China
School of Gemology, China University of Geosciences Beijing, Beijing 100083, China
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Abstract

To meet the growing demand for stable dual-emission phosphors for use in optoelectronic applications, this study investigated a self-reduction strategy with Mn-doped Li2ZnGe3O8 (LZGO) phosphors. The spinel-structured LZGO lattice enables the coexistence of Mn2+ and Mn4+ via oxygen vacancies and lattice defects, achieving visible (Vis) and near-infrared (NIR) dual emission without the need for external reducing agents. Spectroscopic analyses, including X-ray photoelectron spectroscopy (XPS) and diffuse reflectance spectroscopy (DRS), confirmed the presence of heterovalent Mn states, with lifetimes of 3.63 ms (Mn2+) and 0.32 ms (Mn4+) under selective excitation. The LZGO:xMn system thus demonstrates excitation-tunable Vis-NIR luminescence and high stability, making it a cost-effective and environmentally friendly candidate for anticounterfeiting and bioimaging applications. This work presents a defect engineering-driven design concept for developing multifunctional redox-active phosphors with broad application prospects.

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self-reductionMn-doped phosphorsdual-emissionoxygen vacanciesvisible–near-infrared

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Journal of Advanced Ceramics
Volume 14 Issue 8,
August 2025
Article number: 9221118
DOI: 10.26599/JAC.2025.9221118

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Cite this article:
Wang Y, Pan X, Liu Z, et al. Self-reduction-induced Mn heterovalent coexistence for Vis–NIR dual-emission. Journal of Advanced Ceramics, 2025, 14(8): 9221118. https://doi.org/10.26599/JAC.2025.9221118

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Received: 24 April 2025
Revised: 10 June 2025
Accepted: 16 June 2025
Published: 23 June 2025
© The Author(s) 2025.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).