摘要
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261nm至259nm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980nm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254nm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 4 f-5 d 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.
作者
刘钰
刘玉学
姜荣云
杨健
祝汉成
严端廷
刘春光
徐长山
LIU Yu;LIU Yu-xue;JIANG Rong-yun;YANG Jian;ZHU Han-cheng;YAN Duan-ting;LIU Chun-guang;XU Chang-shan(School of Physics,Northeast Normal University,Changchun 130024,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2020年第5期147-153,共7页
Acta Photonica Sinica
基金
国家自然科学基金(Nos.11674050,11874103,11374047)。
