多铝酸钡镁:铕(Ⅱ)磷光体合成方法的改进

二价铕激活的多铝酸钡镁(Ba3-x-yMgxEuy)Al14O24磷光体,是一种新的高效率光致发光材料.它在253.7nm紫外光激发下,发射出峰值波长在450nm左右的带谱,量子效率接近100%,已被认为是高光效、高显色性三基色荧光灯的良好的蓝色成分.它的合成、性质和应用我们已作了报导. 该磷光体合成时,常用BaF2或MgF2为原料.我们的试验结果表明,在合成中引入F-对提高磷光体的发光亮度、降低反应温度确有较大效果;但是磷光体中残留的氟,使得荧光灯的光衰很大.经过分析和试验,采用BaCO3、MgCO3为原料,用适量的HBO3作为助熔剂,使磷光体的发光亮度和荧光灯的光衰二者都得到较满意的结果.

AN IMPROVEMENT IN THE SYNTHESIS OF BLUEEMITTING PHOSPHOR (BaEuMg)3Al14O24

In the ordinary process of preparation of blue-emitting phosphor (BaEuMg)3Al14O24,fluoride compounds are found to be effective in decreasing the preparation temperature and obtaining good luminosity. However, the residue of the fluoride in the phosphors always results in apparent decay.An improved method in which boric acid is used as a flux instead of the fluoride is presented here. In comparison with the ordinary process the maintenance of the phosphor is obviously improved while the preparation temperature and luminosity keep unchanged.