【摘要】 利用溶胶-凝胶法制备了Na₂YMg₂V₃O₁₂:Yb³⁺近红外发光荧光粉。其结构和光学性能分别采用粉末X射线衍射（XRD）、可见及近红外激发和发射光谱进行了表征,并根据发光强度确定掺杂离子的最佳浓度。结合荧光寿命研究了浓度猝灭机理及基质与Yb³⁺之间的能量传递过程,对[VO₄]^3-基团到Yb³⁺可能的能量传递地方式进行了讨论并计算了能量传递效率。表明Na₂YMg₂V₃O₁₂:Yb³⁺可将紫外光有效转换到近红外光,在增强硅基太阳能电池光转化效率方面具有潜在的应用价值。更多还原

【Abstract】 A series of Yb³⁺-doped vanadate garnet Na₂YMg₂V₃O₁₂phosphors with near-infrared（NIR）emission were synthesized via a modified sol-gel method.The structure and phase purity of samples were verified through X-ray diffraction（XRD）.The luminescence properties of the samples were researched by photoluminescence emission（PL）and excitation（PLE）spectra.The optimal concentration,concentration quenching mechanism and the energy transfer betweensubstrate and the Yb³⁺ions were discussed in Yb³⁺-doped Na₂RMg₂V₃O₁₂ samples along with the decay curves.The occurrence of energy transfer（ET）from[VO₄]^3- to Yb³⁺was confirmed by the luminescent spectra and lifetimes,and the energy transfer efficiency was also calculated.Results indicate that the light conversion from UV to NIR was realized in Yb³⁺-doped Na₂YMg₂V₃O₁₂,providing the possibility for the application in the silicon solar cells.更多还原