Fluorescence property of novel near-infrared phosphor Ca2MgWO6:Cr3+
Fluorescence property of novel near-infrared phosphor Ca2MgWO6:Cr3+
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DOI：
10.1016/j.jallcom.2017.10.036
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发表时间：
2018-01
影响因子：
6.2
通讯作者：
Dandan Xu;Xuanmin Wu;Qi Zhang;Wanwen Li;Ting Wang;L. Cao;J. Meng
中科院分区：
文献类型：
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作者：
Dandan Xu;Xuanmin Wu;Qi Zhang;Wanwen Li;Ting Wang;L. Cao;J. Meng
采用固相反应法在空气中制备了Ca 2 MgWO 6：Cr 3+新型近红外长余辉发光材料。X-射线衍射分析表明，所制备的荧光粉具有单相单斜结构，掺杂剂的掺入没有改变荧光粉的晶体结构。在371 nm激发下，Ca 2 MgWO 6：Cr 3+荧光粉显示出与Cr 3+的4 T2 → 4A 2跃迁相对应的宽带近红外荧光。Cr ~（3+）的最佳掺杂浓度为0.4%（mol）。计算了Cr ~（3+）离子间的临界距离，证实了Ca_2 MgWO_6：Cr ~（3+）中的浓度猝灭类型为偶极-偶极相互作用。荧光粉的光谱和衰减曲线表明，存在有效的能量转移从主机到Cr ~（3+）离子。Ca_2MgWO_6：Cr ~（3+）荧光粉还表现出非镓酸盐荧光粉中很少出现的近红外LLP现象。最后，利用简化的能级图分析了Ca_2MgWO_6：Cr ~（3+）荧光粉可能的发光机理和LLP机理以及可能的能量传递过程。
A novel near infrared (NIR) emitting long-lasting phosphorescence (LLP) phosphors of Ca2MgWO6:Cr3+were prepared by solid-state reaction in air. X-ray diffraction patterns showed that the obtained phosphors have a single-phase monoclinic structure and the incorporation of the dopants did not change the crystal structure. When excited at 371 nm, Ca2MgWO6:Cr3+phosphors show characteristic broadband NIR fluorescence corresponding to the4T2→4A2transitions of Cr3+. The optimal Cr3+doping concentration is 0.4% (mol). The critical distance between Cr3+ions has been calculated and the concentration quenching type in Ca2MgWO6:Cr3+was verified to be a dipole-dipole interaction. The optical spectra and the decay curves of the phosphors indicate that there exists efficient energy transfer from host to Cr3+ions. The Ca2MgWO6:Cr3+phosphors also exhibit NIR LLP phenomenon which is seldom presented in non-gallate phosphors. Finally, the possible fluorescence and LLP mechanism and possible energy transfer processes in Ca2MgWO6:Cr3+phosphor are analyzed with simplified energy level diagrams.