采用自蔓延燃烧法结合后期热处理手段制备得到了Y3+/Pr3+共掺杂的CaGdAlO4荧光粉材料.实验结果表明: 当用与Gd3+离子半径较近的Y3+来取代Gd3+时, Pr3+的光致发光强度增强, 使来自 Pr3+的4f-5d跃迁的吸收峰峰值位置发生了从261 nm至259 nm的蓝移.在确定 Y3+的最优浓度为50%, Pr3+的最优浓度为0.5%时, 进一步制备了Y3+/Pr3+/Yb3+共掺杂的CaGdAlO4荧光粉材料, 并实现 了从深紫外到近红外的量子剪裁.在Yb3+的浓度达到6%时, Yb3+位于980 nm的发射峰最强.经计算Y3+/Pr3+/Yb3+共掺杂的CaGdAlO4材料的量子剪裁效率约为168%, 优于Pr3+/Yb3+共掺杂的CaGdAlO4荧 光粉.此外, 在254 nm紫外光照射下, Y3+取代Gd3+的策略在一定程度上抑制了CaGdAlO4荧光粉材料的晶格热化现象.综上, 用价格更低的Y部分取代Gd, 可使CaGdAlO4: Pr3+/Yb3+荧光粉制备成本降 低, 并进一步优化其量子剪裁性能.该研究对硅空间太阳能电池的应用开发具有实际意义.

Y3+/Pr3+ co-doped CaGdAlO4 phosphors were prepared by a self-propagating combustion method in combination with a subsequent heat treatment. The experimental results show that, when Gd3+ is replaced by Y3+, whose ion radius is close to that of Gd3+, the enhanced luminescence intensity of Pr3+ leads to a blue-shift of the maximum position of the absorption peak originating from the 4f-5d transition of Pr3+ from 261 nm to 259 nm. When the optimal concentrations of Y3+ and Pr3+ were determined to be 50% and 0.5%, respectively, Y3+/Pr3+/Yb3+co-doped CaGdAlO4 phosphors were further prepared, and their quantum cutting luminescence from deep ultraviolet to near-infrared was realized. As the Yb3+concentration reaches to 6%, the strongest luminescence of Yb3+ at 980 nm was observed. It is found that the calculated quantum cutting efficiency of Y3+/Pr3+/Yb3+ co-doped CaGdAlO4 phosphors is about 168%, which is higher than that of Pr3+/Yb3+ co-doped CaGdAlO4 phosphors. Moreover, under ultraviolet light (254 nm) irradiation, the strategy of substituting Y for Gd in the CaGdAlO4 host can inhibit the lattice thermalization in a certain extent. In a word, the replacement of Gd by cheap Y can lead to the reduced cost of the phosphors and the improved quantum cutting performance. This study has practical significance for developing and applying silicon space solar cells.