稀土离子掺杂LaAlO3:RE3+(RE=Eu,Tb,Sm,Tm)荧光粉的发光性能

采用溶胶凝胶法合成La_1-xAlO₃：xRE³⁺（RE=Eu，Tb，Sm，Tm）荧光粉，对样品进行热重差热（TGA-DTA）、X射线粉末衍射（XRD）、透射电镜（TEM）以及荧光光谱（PL）等表征，探讨样品的合成温度及稀土离子掺杂浓度对样品发光性能的影响。研究结果表明，当煅烧温度为800~1 200℃时，所合成样品为三方晶体结构。在紫外光激发下，掺杂离子均表现出特征的f-f电子跃迁发射，在一定掺杂浓度范围内，当Eu³⁺、Tb³⁺、Sm³⁺和Tm³⁺的掺杂浓度x值分别为0.02，0.04，0.005和0.005时，样品发光强度最大，在一定波长激发下，样品分别发射出红光、绿光、橙黄光和蓝光，Eu³⁺-Tb³⁺、Eu³⁺-Sm³⁺和Eu³⁺-Tm³⁺共掺杂有可能获得白光。

Luminescent Properties of Rare Earth Ions Doped LaAlO3:RE3+ (RE=Eu,Tb, Sm,Tm) Phosphors

A series of phosphors La_1-xAlO₃:xRE³⁺ (RE=Eu, Tb, Sm, Tm) were synthesized by sol-gel method. Techniques such as thermogravimetric and differential thermal analysis(TGA-DTA), X-ray powder diffraction(XRD), transmission electron microscopy(TEM), photoluminescence emission and excitation spectra were used to characterize the phosphors. The results showed that the synthesized samples were pure phase with trigonal crystal structure when the calcination temperature was from 800℃ to 1 200℃. Under UV light excitation, the doped rare earth ions exhibited f-f feature level transitions. The doped ions gave the strongest emission when the doped concentration (x) of Eu³⁺, Tb³⁺, Sm³⁺ and Tm³⁺ was 0.02, 0.04, 0.005 and 0.005, and gave red, green, orange and blue emission, respectively. Eu³⁺-Tb³⁺, Eu³⁺-Sm³⁺ and Eu³⁺-Tm³⁺ co-doped samples were likely to emit white light.