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.%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+∶2F5/2+2F5/2.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.
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