Eu^3＋掺杂的Y10W2O21纳米荧光粉的制备及其发光性质研究

Synthesis and Luminescence Properties of Y_(10)W_2O_(21):Eu Nanophosphor

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Eu3+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质进行了研究。实验结果证明,Y10W2O21∶Eu纳米发光材料中的Eu3+5 D0—7 F2跃迁的红色发光也能被394nm近紫外光和464nm蓝光有效激发,具有制备成本低、猝灭浓度高等优点,有潜力成为高效的近紫外(蓝光)管芯白光LED用红色荧光粉材料。

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 averagecrystallographic sizes could be confirmed to be approximately 80nm by means of the Scherrer formula,which are in good agree-ment with the particles sizes exhibited by SEM.In the excitation spectra of Y10W2O21∶Eu nanophosphor,by monitoring 610nm,the charge transfer bands（CTB）of O—Eu and O—W,centering at around 270and 307nm,can be observed,respectively.The spectral lines shape and locations of excitation peak corresponding to 4f→4ftransitions are similar in all samples.But therelative intensity ratios between O—Eu and O—W CTB excitation peak increase with the Eu3＋doping concentration increasing.The characteristic red emission at around 610nm of Eu3＋ was also observed,ascribed to the 5 D0→7 F2transition of Eu3＋,andthe optimal doping concentration is 20mol%.Finally,the transition intensity parametersΩλ（λ=2,4）and the quantum efficien-cies of 5 D0level of Eu3＋ were calculated according to Judd-Ofelt theory.The results indicate that Eu3＋5 D0→7 F2610nm red lu-minescence can be effectively excited by 394nm near-UV light and 464nm blue light in Y10W2O21host,which is similar to thefamiliar Eu3＋doped tungstate（e.g.Gd2（WO4）3,CaWO4）.Therefore,the Y10W2O21∶Eu red nanophosphors may have a po-tential application for white LED.