发光学报, 2017, 38 (3): 281, 网络出版: 2017-04-10
Gd3+掺杂浓度对NaErF4∶Yb纳米晶上转换荧光性能的影响
Influence of Gd3+ Doping on The Luminescence Properties of Upconverting NaErF4∶Yb Nanocrystals
摘要
采用温和的溶剂热法制备较强红光发射的NaErF4∶Yb,Gd上转换纳米晶, 控制Gd3+的掺杂浓度实现了晶相和尺寸可控以及上转换荧光的增强。X射线衍射谱(XRD)、透射电子显微镜图像(TEM)和上转换发射光谱结果分析表明, Gd3+掺杂可以有效地促进NaErF4纳米晶的晶相由立方相向六角相转变, 并且减小纳米粒子的尺寸。随着Gd3+掺杂浓度的上升, 上转换荧光强度明显增大。当Gd3+摩尔分数为25%时, 样品的上转换荧光强度达到最大。同时, 研究了在980 nm 近红外激光激发下, Yb3+与Er3+间有效的能量传递以及上转换发光机制。
Abstract
Upconversion NaErF4∶Yb,Gd nanocrystals with bright red emissions were prepared via a facile solvothermal method. The crystalline phase, size and the relative intensity of upconversion luminescence can be simultaneously manipulated by adjusting Gd3+ ions contents. The introduction of Gd3+ can effectively promote the cubic to hexagonal phase transformation, size reduction and obviously upconversion luminescence (UCL) intensity improvement of NaErF4∶Yb,Gd nanocrystals. XRD, TEM and UCL spectra results reveal that the sample co-doped with 25% Gd3+ ions (mole fraction) of NaErF4∶Yb system exhibits the optimized structural and optical properties. Meanwhile, the mechanism involving upconverting photon excitation and energy transfer between Yb3+ ions and Er3+ ions were investigated under the excitation of 980 nm diode laser.
谢婉莹, 安西涛, 酒俊霞, 李静, 冷静, 陈力. Gd3+掺杂浓度对NaErF4∶Yb纳米晶上转换荧光性能的影响[J]. 发光学报, 2017, 38(3): 281. XIE Wan-ying, AN Xi-tao, JIU Jun-xia, LI Jing, LENG Jing, CHEN Li. Influence of Gd3+ Doping on The Luminescence Properties of Upconverting NaErF4∶Yb Nanocrystals[J]. Chinese Journal of Luminescence, 2017, 38(3): 281.