Herein, a series of novel dual-mode NaYF₄:Ln/NaYF₄:Eu (Ln = Yb, Er, Tm) composites involving up-conversion and down-shifting luminescence have been prepared by a facile synthetic method. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray analysis, up-conversion and down-shifting fluorescence spectrometer were used to characterize the materials. By doping different lanthanide ions and tailoring the molar ratio of the doped lanthanide ions, three kinds of composites were obtained which could exhibit three-primary-color (red-green-blue, abbreviating as RGB) up-conversion luminescence under the irradiation of 980 nm laser, and generate red down-shifting color under the excitation of 393 nm. The composites show excellent photoluminescence properties, which attribute to NaYF₄ served as a major matrix for both the up-conversion and down-shifting materials. Moreover, the work provides a promising material for anti-counterfeiting application.

这里，一系列新颖的双模NaYF ₄：Ln / NaYF ₄：Eu（Ln = Yb，Er，Tm）复合材料通过简便的合成方法制备而成，具有上转换和下转换发光。X射线衍射，扫描电子显微镜，透射电子显微镜，能量色散X射线分析，上转换和下移荧光光谱仪被用来表征材料。通过掺杂不同的镧系元素离子并调整掺杂的镧系元素离子的摩尔比，得到了三种复合物，它们在980的照射下均呈现出三基色（红绿蓝，缩写为RGB）上转换发光。激光，并在393纳米的激发下产生红色的下移色。复合材料显示出优异的光致发光性能，这归因于NaYF ₄用作上转换和下转换材料的主要矩阵。而且，这项工作为防伪应用提供了有希望的材料。