采用高温固相法合成R2-x(MoO4)3:xEu3+ (R=Y,Gd)系列红色荧光粉.研究了煅烧温度、助熔剂的含量和Eu3+的掺杂量对样品发光性能的影响,并对样品的物相组成、激发和发射光谱进行分析.结果表明,样品Gd0.6(MoO4)3:1.4Eu3+在800℃左右煅烧时呈单斜晶结构,当煅烧温度提高到950℃左右,呈正交斜晶结构;样品Y0.2(MoO4)3:1.8Eu3+在800℃左右煅烧时已经完全形成了正交结构,当煅烧温度升高到1000℃左右时,其正交结构得到保持,没有发生相变.其中,助熔剂NH4 C1的含量占样品总量的3%,煅烧温度为1000℃,保温3h得到的样品Gd0.6 (MoO4)3:1.4Eu3+和Y0.2 (MoO4)3:1.8Eu3+的发光性能达到最佳.另外,由激发和发射光谱分析表明,该荧光粉可以被近紫外光(395 nm)和蓝光(465 nm)有效激发,发射峰值位于612 nm的红光,对应于Eu3+离子的5 D0→7F2跃迁,是一种可应用在紫外光和蓝光芯片激发产生白光LED的红色荧光粉.
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