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采用热分解法制备了Yb3+和Tm3+共掺杂的KY3F10∶Yb3+、Tm3+纳米晶,用X射线衍射(XRD)、透射电镜(TEM)和上转换光谱对样品进行了表征。研究了Tm3+浓度对样品的上转换发光性能的影响。结果表明制备的样品为类球形立方相KY3F10∶Yb3+、Tm3+纳米晶,粒子尺寸分布均匀,平均粒径约为13nm左右。在980nm半导体激光器激发下,样品发射出蓝光(481nm)和红光(646nm),并且当Tm3+掺杂摩尔分数超过0.4%时,出现了浓度猝灭效应。发光强度与激发功率的关系表明,蓝光和红光的发光都是三光子过程。
The Yb3 + and Tm3 + co-doped KY3F10: Yb3 +, Tm3 + nanocrystals were prepared by thermal decomposition. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and up-conversion spectroscopy. The effect of Tm3 + concentration on the upconversion luminescence properties of the samples was investigated. The results show that the prepared samples are spherical cubic phase KY3F10: Yb3 +, Tm3 + nanocrystals with uniform particle size distribution and average particle diameter of about 13nm. The sample emitted blue (481nm) and red (646nm) emission at 980nm semiconductor laser excitation, and the concentration quenching effect occurred when the mole fraction of Tm3 + doping exceeded 0.4%. The relationship between luminous intensity and excitation power shows that both blue and red luminescence are three-photon processes.