高温固相法合成Ce^3+, Dy^3+掺杂的YGa3(BO3)4及其荧光性质  

Photoluminescence Properties of Ce^3+,Dy^3+ Doped YGa3(BO3)4 Synthesized by High Temperature Solid State Reactions

作　　者：孙裕容 高燕 尹超 丛日红 杨韬[1] Sun Yurong;Gao Yan;Yin Chao;Cong Rihong;Yang Tao(College of Chemistry and Chemical Engineering,Chongqing University,Chongqing 401331,China;College of Chemistry and Material Science,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]重庆大学化学化工学院,重庆401331 [2]中南民族大学化学与材料科学学院,湖北武汉430074

出　　处：《中国稀土学报》2020年第3期405-417,I0003,共14页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金面上项目(21771027,21671028)资助。

摘　　要：通过高温固相法制备了Ce^3+单掺以及Ce^3+, Dy^3+共掺杂YGa3(BO3)4系列荧光粉。通过分析X射线衍射数据,该系列荧光粉的晶胞参数随掺杂离子的浓度增加线性变化,且衍射数据未观察到杂质衍射峰,进而确认稀土离子掺杂成功且样品均为纯相。在YGa3(BO3)4基质中, Ce^3+掺入后在紫外和近紫外区有很强的宽带吸收,其荧光发射波长也位于近紫外区,因此可作为敏化剂来增强Dy^3+在该基质中的白光发射。通过对Ce^3+, Dy^3+共掺杂荧光粉的光谱研究,确认了Ce^3+→Dy^3+存在有效的能量传递,传递机制以四级-四级相互作用为主。Y0.79Ce0.10Dy0.11Ga3(BO3)4中传递效率达到61.58%, Ce^3+的敏化使得Dy^3+的发光大幅增强。在273 nm激发下, Y0.89Ce0.1Dy0.01Ga3(BO3)4发射光谱的色坐标为(0.3268,0.3438),色温为5749 K,接近标准白光色坐标。Ce^3+ doped and Ce^3+, Dy^3+ codoped YGa3(BO3)4 were prepared by high temperature solid state reactions. The cell lattice parameters, which were obtained according to powder X-ray diffraction, exhibit a linear correlation with the doping concentration of rare earth. No impurity peaks were observed, and all phosphors were identified to be pure. In the YGa3(BO3)4 host, Ce^3+ has strong absorption bands in UV and near UV range, and its emission also locates at the UV range, then it could act as an activator to enhance the Dy^3+ white emission. Indeed, there exists an efficient energy transfer from Ce^3+ to Dy^3+ based on the detailed analyses on photoluminescence spectra. The mechanism of the energy transfer is mainly quadrupole-quadrupole interactions. A high transfer efficiency of 61.58% is achieved in Y0.79Ce0.10Dy0.11Ga3(BO3)4. Under the 273 nm irradiation, the CIE coordinate and correlated color temperature of Y0.89Ce0.1Dy0.01Ga3(BO3)4 is(0.3268, 0.3438) and 5749 K, respectively.

关 键 词：高温固相法 稀土硼酸盐 粉末X射线衍射 荧光 能量传递 

分 类 号：O611.4[理学—无机化学]