Pr3+,Yb3+共掺YPO4下转换材料的制备及其转光效率

采用固相反应法制备了Pr³⁺,Yb³⁺共掺杂的YPO₄下转换发光粉体,并在450 nm光激发条件下,研究了Yb³⁺不同摩尔分数(0%,1%,2%,4%,20%,30%)对转光效率的影响。结果表明:不同Yb³⁺浓度的样品,其荧光峰强度不同,这可能是由于Pr³⁺-Yb³⁺之间Yb³⁺浓度不同存在能量传递效率差异的原因。研究也发现了样品的下转换发光,其能量传递过程为:Pr³⁺:³P₀→Yb³⁺:²F_5/2+²F_5/2。荧光光谱测试结果表明,Yb³⁺的最佳掺杂摩尔分数为2%。Pr³⁺,Yb³⁺共掺杂的YPO₄材料在提高太阳能电池光电转换效率方面具有潜在的应用。

Downconversion Materials Preparation and The Research of Conversion Efficiency in Pr3+ , Yb3+ Co-doped YPO4

Pr3+,Yb3+ co-doped YPO4 downconversion phosphor powders were prepared by solid state reaction.When excitation at 450 nm,the effects of different Yb3+ mole fractions(0%,1%,2%,4%,20%,30%) on the conversion efficiency are studied.Results shows that because of the difference of energy transfer efficiency between Pr3+ and Yb3+,the samples with various Yb3+ doping concentrations have different fluorescence intensity.It is also found that the energy transfer process of the downconversion luminescence in samples is Pr3+:3P0→Yb3+:2F5/2+2F5/2.From photoluminescence spectra measurement,the optimal doping mole fraction of Yb3+ is 2%.The results indicate that Pr3+,Yb3+ co-doped YPO4 downconversion phosphor is a kind of potential material which may be used to improve the solar cell efficency.