Eu3+掺杂的Y10W2O21纳米荧光粉的制备及其发光性质研究

用沉淀法合成了Y10W2O21:Eu纳米发光材料,利用X射线衍射谱(XRD)和场发射扫描电镜(FE-SEM),对样品的结构和形貌进行了表征.测量了各样品的激发光谱、发射光谱,绘制了Eu3+发光的浓度猝灭图,计算了各样品的部分J-O参数和EC+5 D0能级量子效率,对Eu3+掺杂的Y10W2O21纳米发光材料的光致发光性...

Synthesis and luminescence properties of Y10W2O21:Eu nanophosphor

In the present paper, a novel nanophosphor, Y10W2O21:Eu was synthesized through a simple and low-cost method: co-precipitation. The results of XRD show that resultant samples are Orthorhombic phase and primitive lattice. The average crystallographic sizes could be confirmed to be approximately 80 nm by means of the Scherrer formula, which are in good agreement with the particles sizes exhibited by SEM. In the excitation spectra of Y10W2O21:Eu nanophosphor, by monitoring 610 nm, the charge transfer bands (CTB) of O--Eu and O--W, centering at around 270 and 307 nm, can be observed, respectively. The spectral lines shape and locations of excitation peak corresponding to 4f-->4f transitions are similar in all samples. But the relative intensity ratios between O--Eu and O--W CTB excitation peak increase with the Eu3+ doping concentration increasing. The characteristic red emission at around 610 nm of Eu3+ was also observed, ascribed to the (5)D0--(7)>F2 transition of Eu3+, and the optimal doping concentration is 20 mol%. Finally, the transition intensity parameters omega(lamda = 2,4) and the quantum efficiencies of (5)D0 level of Eu3+ were calculated according to Judd-Ofelt theory. The results indicate that Eu(3+5)D0-->(7)F2 610 nm red luminescence can be effectively excited by 394 nm near-UV light and 464 nm blue light in Y10W2O21 host, which is similar to the familiar Eu3+ doped tungstate (e.g., Gd2(WO4)3, CaWO4). Therefore, the Y10W2O21:Eu red nanophosphors may have a potential application for white LED.