稀土掺杂的NaGdF<sub>4</sub>上转换发光材料的合成与发光特性研究

李艳红; 臧国凤; 马晶; 刘宇田

doi:doi:10.3788/fgxb20133408.0982

发光学报, 2013, 34 (8): 982, 网络出版: 2013-08-28

稀土掺杂的NaGdF₄上转换发光材料的合成与发光特性研究

Synthesis and Luminescence Properties of Rare Earth Doped NaGdF₄ Upconversion Phosphors

论文大纲

李艳红 ^*臧国凤马晶刘宇田

作者单位

沈阳化工大学材料科学与工程学院, 辽宁沈阳110142

水热法发光粉上转换发光 NaGdF4∶Re NaGdF4∶Re hydrothermal method phosphors upconversion luminescence

摘要

采用水热法制备了一系列不同掺杂浓度的NaGdF4∶Re（Re=Tm3+, Er3+, Yb3+）上转换发光粉。通过X射线衍射（XRD）、电子扫描电镜（SEM）和上转换发射光谱对样品进行了表征。XRD研究结果表明: 合成的样品均为六方结构NaGdF4。估算的平均晶粒尺寸为41～43 nm。在980 nm红外光激发下, Er3+和Yb3+共掺杂的NaGdF4发光粉发出分别来自于Er3+离子2H11/ 2,4S3/2→4I15/2跃迁的绿光和4F9/2→4I15/2跃迁的红光发射, Tm3+和Yb3+共掺杂的NaGdF4发光粉发出分别来自Tm3+离子的1G4→3H6跃迁的蓝光、1G4→3F4和3F2,3→3H6跃迁的红光和3H4→3H6跃迁的近红外光发射。Er3+,Tm3+和Yb3+共掺杂的NaGdF4发光粉的发光强度及红、绿、蓝光发射的相对强度受Yb3+离子掺杂浓度的影响。对样品中可能的上转换发光机制进行了讨论。计算的色坐标显示: 可通过改变掺杂离子浓度对上转换发光的颜色进行调控。

Abstract

A series of NaGdF4∶Re（Re=Tm3+, Er3+, Yb3+） upconversion luminescence phosphors with various doping concentrations were prepared by a hydrothermal method. X-ray diffraction (XRD), field emission scanning electron microscope (SEM) and upconversion (UC) emission spectra were used to characterize the samples. The results of XRD indicate that all the samples are hexagonal phase NaGdF4. The average crystallite sizes are estimated to be 41～43 nm. Under 980 nm laser excitation, the Er3+ and Yb3+ codoped NaGdF4 phosphors show green emission from 2H11/ 2→4I15/2 and 4S3/2→4I15/2 transitions of Er3+ ions, the red emissions attributed to 4F9/2→4I15/2 transitions of Er3+ ions, respectively. The Tm3+ and Yb3+ codoped NaGdF4 phosphors show blue emission from 1G4→3H6 transitions of Tm3+ ions, red emission assigned to 1G4→3F4 and 3F2,3→3H6 transitions of Tm3+ ions, near-infrared corresponding to the 3H4→3H6 transitions of Tm3+ ions, respectively. The upconversion luminescence intensity and a relative intensity of red, green and blue emission are governed by the doping Yb3+ concentrations in Er3+, Tm3+ and Yb3+ tridoped NaGdF4 phosphors. The possible upconversion luminescence mechanisms of the samples are discussed. The calculated CIE color coordinates display that the upconversion luminescence color can be tuned by varying the doping ions concentration.

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李艳红, 臧国凤, 马晶, 刘宇田. 稀土掺杂的NaGdF₄上转换发光材料的合成与发光特性研究[J]. 发光学报, 2013, 34(8): 982. LI Yan-hong, ZANG Guo-feng, MA Jing, LIU Yu-tian. Synthesis and Luminescence Properties of Rare Earth Doped NaGdF₄ Upconversion Phosphors[J]. Chinese Journal of Luminescence, 2013, 34(8): 982.

稀土掺杂的NaGdF₄上转换发光材料的合成与发光特性研究

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