数字农科院2.0

Ultra-Wide Vis–NIR Mg2Al4Si5O18:Eu2+,Cr3+ Phosphor Containing Unusual NIR Luminescence Induced by Cr3+ Occupying Tetrahedral Coordination for Hyperspectral Imaging

文献类型： 外文期刊

作者： Zou X.; Zhang H.; Li W.; Zheng M.; Molokeev M.S.; Xia Z.; Zheng Y.; Li Q.; Liu Y.; Zhang X.; Lei B.

作者机构：

关键词： Aluminum compounds; Geometry; Hyperspectral imaging; Infrared devices; Light; Light emitting diodes; Luminescence; Nondestructive examination; Optical properties; Phosphors; Silicon; Silicon compounds; Spectroscopy; Cr 3+; Energy-transfer; Lightemitting diode; Near Infrared; Near infrared luminescence; Near-infrared; Near-infrared emissions; Near-infrared phosphors; Ultra-wide; Visible near-infrared; Energy transfer

期刊名称： Advanced Optical Materials

ISSN： 2195-1071

年卷期： 2022 年

页码：

收录情况： SCIE（2022版） ; EI（2022版）

摘要： Cr3+-activated broadband near-infrared (NIR) phosphors, featured by the octahedral coordination preference and strong absorption in visible (Vis) region, have great potential application in nondestructive assessment. It is still a challenge to develop Cr3+-doped phosphors with the tetrahedrally coordinated Cr3+ NIR emission behavior and ultra-wide Vis–NIR luminescence. Herein, an unusual NIR-emitting Mg2Al4Si5O18:Cr3+ phosphor offers emission peak at 867 nm with full-width at half-maximum of 237 nm due to preferential occupation of the AlO4 tetrahedra by Cr3+ as demonstrated by structural and optical properties studies. Eu2+–Cr3+ energy transfer is proposed to induce ultra-wide Vis–NIR Mg2Al4Si5O18:Eu2+,Cr3+ phosphors with more efficient NIR emission and lower thermal quenching behavior of Cr3+. The fabricated Vis–NIR phosphor-converted light-emitting diode is expected to be an alternative to halogen lamp in hyperspectral imaging. This work reveals the luminescence behavior of Cr3+ in tetrahedra and demonstrates the application of Mg2Al4Si5O18:Eu2+,Cr3+ phosphor in hyperspectral imaging, which will facilitate further research on NIR and Vis–NIR phosphors. © 2022 Wiley-VCH GmbH.

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