摘要
采用草酸根沉淀稀土粒子使其充分混合进行前处理,用固相反应合成了硼钒酸钇钆铕稀土荧光红粉。对试样进行了X射线衍射、光致激发和发射光谱表征。产物与(Y,Gd)VO4:Eu相比,掺入了与钒等摩尔量的硼,硼的掺入提高了发光强度,但没有改变钒酸盐的四方晶系结构。分析了不同浓度Gd3+掺杂对试样发光强度的影响以及基质离子VO43-和BO33-对激活剂Eu3+的能量传递机理。同时将产物与(Y,Gd)VO4:Eu和(Y,Gd)BO3:Eu的发光性能进行对比,发现(Y,Gd)-(BO3,VO4):Eu具有更好的发光强度和色纯度,有望在工业上作为一种优良的新型灯用或PDP显示器用荧光粉。所用方法与传统固相法相比,反应温度降低了100℃,所得试样易粉碎、粒度细,发光强度提高10%以上。
The red fluorescence powder of Gd and Eu co-doped yttrium borovanadate was prepared for the first time by the modified solid state reaction method with the precursor synthesized by co-precipitates of ammonium oxalate and characterized with x-ray diffraction, emission and excitation spectra. Compared with （Y, Gd, Eu）VO4, the sample was impregnated with boric acid in the same number of moles as vanadium element, in which the boron element improves the emission intensity due to the BO33 imparting energy to Eu^3＋ without any lattice change of tetragonal （Y, Gd, Eu）VO4. Also, the optimum ratio of Gd^3＋ doped in the sample was ascertained according to the relative brightness for a series of samples. The effect of Gd^3＋ content on the emission intensity of the product was researched, and the mechanism that VO4^3- and BO3%3- transfer energy to Eu^3＋ was analyzed in this article. The luminescent characteristic of （Y, Gd, E u）（BO3, VO4） was contrasted to （Y, Gd）VO4：Eu and （Y, Gd）BO3：Eu, separately. It can be concluded that the （Y, Gd, Eu ）（BO3,V 04） possess better emission intensity and color purity as new type of fluorescent materials used for lamps and Plasma Display Panels. Also, comparing the modified method with the traditional solid state method, the reaction temperature descends for 100℃, the luminous intensity increases in above 10 percent, the product is easier to comminute to be much smaller in diameter of the particles.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期273-277,共5页
Rare Metal Materials and Engineering
基金
宁夏自然科学基金项目(F002-2004)
宁夏大学科技开发项目
