分别采用柠檬酸溶胶-凝胶法、半干半湿法和高温固相法制备了CaGdAlO4:Eu3+荧光粉, 并用X射线衍射(XRD)分析、场发射扫描电镜(FE-SEM)观察和荧光光谱分析研究了不同制备方法和制备条件对CaGdAlO4:Eu3+形貌、粒径和发光性质的影响. XRD结果表明, 柠檬酸溶胶-凝胶法、半干半湿法和固相法制备CaGdAlO4:Eu3+生成纯相的温度分别为900, 1200和1400 ℃. FE-SEM照片显示CaGdAlO4:Eu3+ 颗粒粒径随温度的升高而增大, 在同一烧结温度下, 粒径大小为柠檬酸溶胶-凝胶法最小, 半干半湿法居中, 高温固相法最大而且团聚现象严重. 以280 nm 近紫外光激发, CaGdAlO4:Eu3+发出明亮的橙红色荧光, 以Eu3+的5D0→7F2跃迁为主, 发光强度随烧结温度的升高而增加, 在1400 ℃烧结温度下, 以半干半湿法得到的样品发光最强. 室温和低温发射谱中Eu3+的5D0→7Fj发射峰的数目都表明: Eu3+ 在CaGdAlO4中只占据偏离反演中心的一种格位.
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