紫外光激发（Y，Ce）PO4荧光粉的发光特性

Luminescence of YPO4 doped with Ce3+ under UV excitation

摘要:

采用高温固相反应法在碳粉还原气氛下制备了（Y1- x Cex ）PO4（ x＝0.01，0.06，0.1，0.15，0.2）荧光粉，研究了Y0.9 Ce0.1 PO4荧光粉的激发光谱、发射光谱、15K时的低温荧光寿命以及Ce3＋浓度对YPO4∶Ce荧光粉相对发射强度的影响，并研究了颗粒的形貌和粒度分布．结果表明，（Y ，Ce）PO4体系中的Ce3＋在基质晶格中占据1个格位，其发射光谱曲线由333 nm和355 nm宽带发射构成；随着Ce3＋浓度的增加，其相对发射强度是先升高后降低，最佳Ce3＋掺杂摩尔浓度为0.1；15 K时的荧光寿命为7.92 ns ，中心粒径为2.1μm ．

Abstract:

The phosphors Y1 - xCexPO4 (x=0 .01 ,0.06 ,0.1 ,0.15 ,0.2) were prepared by high temperature solid state reaction .In this paper ,the excitation and emission spectra of YPO4 ∶Ce phosphor were investi-gated .Fluorescence lifetime of 15K and influence of Ce3+ concentration on relative brightness of YPO 4 ∶Ce phosphor were examined .The morphology and size distribution of particles were also studied .The re-sults showed there was one Ce3+ lattice site in YPO4 doped with Ce3+ .The emission spectra of Y1 - x Cex PO4 were composed of broad band at 333 nm and 355 nm .The relative intensity varied with Ce3+ concen-tration ,increasing first and then decreasing ,the maximum concentration of Ce3+is 0.1 mol .T he fluores-cence lifetime at 15K and center size are 7.92 ns and 2.1 μm ,respectively .