1. Ultra‐Wide Vis–NIR Mg2Al4Si5O18:Eu2+,Cr3+ Phosphor Containing Unusual NIR Luminescence Induced by Cr3+ Occupying Tetrahedral Coordination for Hyperspectral Imaging.
- Author
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Zou, Xikun, Zhang, Haoran, Li, Wei, Zheng, Mingtao, Molokeev, Maxim S., Xia, Zhiguo, Zheng, Yinjian, Li, Qingming, Liu, Yingliang, Zhang, Xuejie, and Lei, Bingfu
- Subjects
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LUMINESCENCE , *OPTICAL properties , *LIGHT emitting diodes , *INFRARED absorption , *PHOSPHORS , *ENERGY transfer , *TERBIUM , *TETRAHEDRA - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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