LaVo4: Eu Phosphor Films with Enhanced Eu Solubility
LaVo4: Eu Phosphor Films with Enhanced Eu Solubility
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DOI：
10.1063/1.3554749
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发表时间：
2011-02
影响因子：
4
通讯作者：
T. Higuchi;Y. Hotta;Y. Hikita;S. Maruyama;Y. Hayamizu;H. Akiyama;H. Wadati;D. Hawthorn;T. Regier;R. Blyth;G. Sawatzky;H. Hwang
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文献类型：
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作者：
T. Higuchi;Y. Hotta;Y. Hikita;S. Maruyama;Y. Hayamizu;H. Akiyama;H. Wadati;D. Hawthorn;T. Regier;R. Blyth;G. Sawatzky;H. Hwang
已知Eu掺杂稀土原钒酸盐是良好的红色荧光粉材料。特别是，LaVO{sub 4}:Eu 是一个有前途的候选者，因为它具有较低的 Eu 位点对称性，因此在 Judd-Ofelt 理论中具有较高的偶极跃迁概率。然而，Eu 在 LaVO{sub 4} 中的低溶解度极限（< 3 mol%）阻碍了其作为磷光体的有效使用。我们提供了通过脉冲激光沉积和后退火生长的 LaVO{sub 4}:Eu 薄膜中 Eu 溶解度高达 10 mol% 的光学证据。当激发低于主体带隙时，光致发光强度超过了 YVO{sub 4}:Eu 薄膜，表明 LaVO{sub 4} 中 Eu 的直接发射更强。
Eu doped rare-earth orthovanadates are known to be good red phosphor materials. In particular, LaVO{sub 4}:Eu is a promising candidate due to the low Eu-site point symmetry, and thus high dipole transition probability within Judd-Ofelt theory. However, the low solubility limit (< 3 mol %) of Eu in LaVO{sub 4} prevents its efficient use as a phosphor. We present optical evidence of enhanced Eu solubility as high as 10 mol % in LaVO{sub 4}:Eu thin films grown by pulsed laser deposition and postannealing. The photoluminescent intensity exceeded that of YVO{sub 4}:Eu thin films when excited below the host bandgap, indicating stronger direct emission of Eu in LaVO{sub 4}.