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绿色钒酸盐荧光粉Ca5Mg4(VO4)6的制备和发光性能

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Abstract:

采用固相反应法合成了绿色钒酸盐荧光粉Ca5Mg4(VO4)6,采用X射线衍射、扫描电子显微镜、X射线能量色散谱仪、Raman光谱仪和荧光分光光度计对荧光粉的相组成、形貌和发光性能进行表征。讨论了烧结温度和热处理温度对荧光粉发光性能的影响。结果表明,经热处理制得单一相荧光粉Ca5Mg4(VO4)6,荧光粉颗粒呈短柱状,直径约为2μm,长度约为5μm。在近紫外激发下荧光粉的发射峰位于510nm处,最强激发峰为365nm。随着烧结温度的升高,荧光粉的发射光谱(PL)和激发光谱(PLE)强度增大,激发峰值位置有红移;随着热处理温度的升高,荧光粉的PL和PLE强度先增大后减小,激发峰值位置仍有明显红移。其中,在700℃烧结5h和900℃热处理8h所制得的荧光粉在365nm激发下发光强度最高。

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