不同形貌的LaPO4：Dy荧光粉的制备及其真空紫外激发下的发光性能

在水热法中通过改变磷源以及反应溶剂成功合成出了不同形貌的LaPO₄：Dy荧光粉，考察了真空紫外激发下不同形貌的LaPO₄：Dy荧光粉的发光性能.结果表明，由于采用的磷源不同，不同形貌的LaPO₄：Dy荧光粉的发光强度会受到影响；其次颗粒尺寸的大小也会影响发光强度.而形貌对Dy³⁺离子占据的格位的对称性影响不大，三种形貌的LaPO₄：Dy荧光粉的黄蓝比都在1—1.5之间.从激发光谱的对比中可知LaPO₄基质向Dy³⁺离子传递能量的效率不如向其他稀土离子，如Eu³⁺离子的效率高，同时在激发光谱中还观察到了较强的Dy³⁺离子的f-d跃迁激发峰. 关键词： 3+')" href="#">Dy³⁺ 真空紫外 发光

Synthesis and luminescenct properties of LaPO4:Dy phosphors with different morphology

LaPO₄：Dy phosphors with different morphology were prepared by adjusting phosphorus sources and reagent in hydrothermal reaction and their vacuum ultraviolet excited luminescence were investigated. The results show that the luminescent intensity of LaPO₄：Dy phosphor varies for different morphologies and different particle size. The site symmetry of Dy³⁺ ions in the LaPO₄：Dy phosphor with three different morphologies was consistent and the ratio of yellow emission to blue emission of the three phosphors was kept in 1 to 1.5. From the comparison of the excitation spectra of LaPO₄：Dy and GdPO₄：Eu it could been seen that the energy transfer efficiency from phosphate host to Dy³⁺ ion is lower than that to Eu³⁺ ion. Meanwhile stronger f-d transition was observed in the excitation spectra.