Zhang Wei, Yuan Chuanjun, Hua Ruinian, Liu Tianqing, Song Kedong, Yu Jicheng, Tang Dongxin, Gao Ye, Chen Baojiu
J Nanosci Nanotechnol. 2016 Jan;16(1):822-7. doi: 10.1166/jnn.2016.10891.
Eu³⁺-doped Na₂Dy₄(WO₄)₇ nanophosphors were synthesized via a co-precipitation method. The crystal structure and morphology of the nanophosphors were characterized by X-ray diffraction analysis and field emission scanning electron microscopy, respectively. For all Eu³⁺ doping concentrations, spherical particles with an average diameter of about 40 nm and consisting of a pure Na₂Dy₄(WO₄)₇ phase were obtained. The excitation and emission properties of the nanophosphors were examined by fluorescence spectroscopy and the energy transfer between Eu³⁺ and Dy³⁺ was studied. Furthermore, the influence of the Eu³⁺ concentration on the color coordinates and luminescence intensity is discussed. The nanophosphors could easily be excited by ultraviolet (UV) and near-UV light corresponding to the f-f transitions of Dy³⁺. The color coordinates of the nanophosphors light emission are in the white light region and the Commission Internationale de l'Éclairage (CIE) coordinates of the nanophosphors light emission varied between (0.331, 0.354) and (0.405, 0.368) depending on the Eu³⁺ doping concentration.
采用共沉淀法合成了Eu³⁺掺杂的Na₂Dy₄(WO₄)₇纳米磷光体。分别通过X射线衍射分析和场发射扫描电子显微镜对纳米磷光体的晶体结构和形貌进行了表征。对于所有的Eu³⁺掺杂浓度，均获得了平均直径约为40 nm且由纯Na₂Dy₄(WO₄)₇相组成的球形颗粒。通过荧光光谱研究了纳米磷光体的激发和发射特性，并研究了Eu³⁺与Dy³⁺之间的能量转移。此外，还讨论了Eu³⁺浓度对色坐标和发光强度的影响。纳米磷光体能够很容易地被对应于Dy³⁺的f-f跃迁的紫外光（UV）和近紫外光激发。纳米磷光体发光的色坐标位于白光区域，并且根据Eu³⁺掺杂浓度的不同，纳米磷光体发光的国际照明委员会（CIE）坐标在(0.331, 0.354)和(0.405, 0.368)之间变化。
