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.
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