共掺调剂离子Na+/Gd^3+调控Eu∶CaF2晶体的发光特性研究  

Luminescent Properties of Eu∶CaF2 Crystal Controlled byCo-doping Na+/Gd^3+

作　　者：方紫璇 于浩[1] 钱小波[1] 姜大朋[1] 赵洪阳[2] 熊伦[2] 苏良碧[1] FANG Zixuan;YU Hao;QIAN Xiaobo;JIANG Dapeng;ZHAO Hongyang;XIONG Lun;SU Liangbi(Key Laboratory of Transparent and Opto-functional Inorganic Materials,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China;Key Laboratory for Optical Information Technology of Hubei Province,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]中国科学院上海硅酸盐研究所,透明光功能无机材料重点实验室,上海201899 [2]武汉工程大学,湖北省光学信息技术重点实验室,武汉430205

出　　处：《人工晶体学报》2020年第8期1548-1554,1561,共8页Journal of Synthetic Crystals

基　　金：国家自然科学基金(61925508,61635012);湖北省教育厅科学研究重点项目(D20151506)。

摘　　要：采用多孔坩埚温度梯度法生长了0.6at%Eu∶CaF2晶体和共掺0.6at%Eu,6.4at%Na∶CaF2,0.6at%Eu,6.4at%Gd∶CaF2晶体。XRD测试表明晶体仍均表现为纯CaF2的立方相,共掺后吸收强度降低。以398 nm氙灯激发晶体材料,荧光光谱表明共掺调剂离子后可明显增加Eu^2+在424 nm处的发光强度,而Eu^3+的特征发射5D 0→7F J(J=1,2,3,4)除了表现出半峰宽变大外,峰位和强度均无明显变化。0.6at%Eu,6.4at%Gd∶CaF2表现出Eu^3+的5D 2→7F 3和5D 0→7F 0特征发射峰,主要可能归因于共掺Gd^3+后打破了非反演对称结构,R值(电、磁偶极跃迁比值)明显降低,提高了晶体格位结构的对称性。共掺Na+后在CIE色域坐标图上显示坐标由(0.3037,0.1425)可变为(0.2043,0.0626),对应从紫色到蓝色的色域调控。The crystal of 0.6at%Eu∶CaF2 and 0.6at%Eu,6.4at%Na∶CaF2,0.6at%Eu,6.4at%Gd∶CaF2 were grown by porous crucible temperature gradient method.XRD results indicate that these crystals are still keeping a pure CaF2 cubic phase,and the absorption intensity decreases after co-doping.The fluorescence spectrum of the crystal material excited by 398 nm xenon lamp shows that the luminescence intensity of Eu^2+at 424 nm could significantly increases after the co-mixing of ions,while the characteristic emission of Eu^3+5D 0→7F J(J=1,2,3,4)shows no obvious change either in peak position or intensity except for a broadening of full width at half maximum(FWHM).The emissions of 5D 2→7F 3 and 5D 0→7F 0 transitions in 0.6at%Eu,6.4at%Gd∶CaF2 are mainly due to the fact that the inversion center lattice is broken after co-doped Gd^3+,and the R value(electric and magnetic dipole transition ratio)significantly reduces,which improves the symmetry of crystal lattice structure.After co-doping Na+,the coordinates of CIE color gamut changes from(0.3037,0.1425)to(0.2043,0.0626),corresponding to the gamut regulation from purple to blue.

关 键 词：Eu∶CaF2晶体 光谱调控 发光 Na+/Gd^3+共掺 多孔坩埚温度梯度法 

分 类 号：O734[理学—晶体学]