Nb^(5+)、Sm^(3+)共掺杂YTaO_(4)的长余辉发光性质

Long-lasting Phosphorescence in Nb^(5+)and Sm^(3+)Codoped YTaO_(4)

采用高温固相法合成了Nb^(5+)、Sm^(3+)共掺杂YTaO_(4)长余辉发光材料,通过X射线粉末衍射(XRD)、稳态荧光光谱、漫反射光谱和热释光曲线等多种表征手段研究了材料的结构、荧光和长余辉发光特性。XRD结果表明,共掺杂Nb^(5+)和Sm^(3+)没有引起YTaO_(4)晶体结构的改变。光谱分析表明,共掺Nb^(5+)不仅可大幅提高YTaO_(4)中Sm^(3+)的长余辉发光强度,而且可实现长余辉发光颜色的调控。对Sm^(3+)和Nb^(5+)共掺杂调控长余辉发光特性的机理也进行了分析。

The Y_(0.98)Sm_(0.02)TaO_(4) long lasting phosphorescence(LLP)material was synthesized by high temperature solid state reaction,and the co-doping experiment of replacing Ta5+with Nb^(5+)was also carried out.The results of X-ray powder diffraction spectra shown that the doped ions did not change the crystal structure of YTaO_(4).Through room temperature steady-state photoluminescence(PL)and long-lasting phosphorescence experiments,it is found that the addition of Nb^(5+)can greatly increase the intensity of long-lasting phosphorescence of Sm^(3+)in YTaO_(4)and change the emission color of PL and LLP.In this paper,the properties and mechanism of PL and LLP of YTaO_(4)∶Sm^(3+),Nb^(5+)are studied,respectively.