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

第一作者： Zou, Xikun

作者： Zou, Xikun;Zhang, Haoran;Li, Wei;Zheng, Mingtao;Liu, Yingliang;Zhang, Xuejie;Lei, Bingfu;Zhang, Haoran;Zheng, Mingtao;Lei, Bingfu;Molokeev, Maxim S.;Xia, Zhiguo;Zheng, Yinjian;Li, Qingming

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关键词： energy transfer; hyperspectral imaging; light-emitting diodes; near-infrared emission

期刊名称：ADVANCED OPTICAL MATERIALS （ 影响因子：10.05； 五年影响因子：9.746 ）

ISSN： 2195-1071

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收录情况： SCI

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.

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