荧光粉
发光
八面体
宽带
材料科学
近红外光谱
红外线的
领域(数学)
八面体对称
离子
分析化学(期刊)
光电子学
光学
化学
物理
有机化学
色谱法
纯数学
数学
作者
Song Li,Jiayu Wu,Ruiyang Li,Zhenzhen Zhang,Zhongxian Qiu,Yongfu Liu,Shixun Lian
标识
DOI:10.1016/j.ceramint.2023.01.048
摘要
Cr3+-activated NIR phosphors have received increasing attention due to their versatile applications. Cr3+ generally shows tunable NIR emission by occupying a six-coordinated field (Oh). Herein, we discover broadband NIR emission of Cr3+ at the five-coordinated field in the phosphors BaXP2O7:Cr3+ (X = Mg/Zn) for the first time. The five-coordinated [MgO5] (D3h) or [ZnO5] (C4v) site provides a quasi-octahedral field. The symmetry of D3h and C4v fields is lower than that of Oh, thus leading to further splitting of the energy levels and generating the broadband NIR emission from 700 to 1100 nm. This work breaks through the traditional limitation of NIR luminescence of Cr3+ in the six-coordinated field and opens a new window to explore novel NIR phosphors of Cr3+ in five-fold coordination.
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