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采用微乳液-水热结合法制备了NaYF4:Yb3+,Er3+,Tm3+纳米粒子,利用X射线衍射(XRD)、扫描电镜(SEM)等手段对样品的物相、结构和形貌进行了分析与表征。产物的X射线衍射峰与标准卡片PDF#77-2042完全一致,属于立方相NaYF4;SEM图片显示所制备的纳米粒子形貌和粒径都比较均一,为120nm左右的棉花状小球,由纳米微粒聚集而成;在980nm光的激发下,纳米粒子能够同时发出蓝光(438和486nm)、绿光(523和539nm)和红光(650nm);通过调节Tm3+:Er3+的比例(0,0.5,0.8,1,2,3,5,7),由色度坐标图(CIE)可以看出当Tm3+和Er3+的比例从0增加到2时,样品的整体发光光色是向绿光方向移动;当Tm3+和Er3+的比例为1:1时,得到伪白光;Tm3+和Er3+的比例从2到7时,样品整体的发光向红光方向移动。
NaYF4: Yb3 +, Er3 +, Tm3 + nanoparticles were prepared by microemulsion-hydrothermal method. The phase, structure and morphology of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) . The X-ray diffraction peak of the product is exactly the same as that of the standard card PDF # 77-2042 and belongs to the cubic phase NaYF4. SEM images show that the morphology and particle size of the prepared nano-particles are relatively uniform, (438 and 486nm), green light (523 and 539nm) and red light (650nm) at the same time under the excitation of 980nm light. By adjusting the ratio of Tm3 +: Er3 + (0, 0.5, 0.8, 1, 2, 3, 5 and 7). It can be seen from the chromaticity diagram (CIE) that when the ratio of Tm3 + and Er3 + increases from 0 to 2, the overall luminescent light color of the sample moves towards the green light. When the ratio of Tm3 + to Er3 + is 1: 1, pseudo-white light is obtained. When the ratio of Tm3 + and Er3 + is from 2 to 7, the overall luminescence of the sample moves toward the red light.