分步滴定法制备YAG荧光粉

Preparation of YAG∶Ce Yellow Phosphor by Step-by-Step Precipitation Method

在室温下，采用分步滴定法得到高亮度LED所用的Y3-x-yGdxCeyAl5O12荧光粉，并以0．1mol／L的碳酸氢铵和氨水为沉淀剂，将其分步滴入金属盐离子混合液中，研究了掺杂Gd离子对荧光粉发光性能的影响。结果表明，以Ce为激活中心，最佳掺量为0．06，加入助熔剂后，荧光粉的发光性能提高了50％左右；随着Gd^3＋取代量的增加，荧光粉样品发射光谱的峰值波长可红移5-10nm，同时，Gd^3＋对发光中心Ce^3＋的影响增强，当取代浓度32为0．1时发光最强。XRD测试结果表明Gd离子的掺入对YAG相的形成并没有影响。

At room temperature, the high-brightness LED with Y3-x-y Gdx Cey Al3O12 yellow phosphor was obtained by step-by-step precipitation method, and using 0. 1mol/L ammonium bicarbonate and aqueous ammonia as the precipitation agent. The effect of doping Gd3＋ ions in Y3-x-y GdxCey Al3O12 phosphor on luminescent enhaucement was studied. The results show that the relative intensity increases with increasing content of Ce, and achieving the maximum value is y=0. 06, By doping flux, phosphor light-emitting performance improves over 50 percent, the peak wavelength changes about 5-10nm with the addition of Gd3＋ , With the increase of replacing quantity, the influence of Gd3＋ on Ce3＋ is also enhanced, Luminescent intensity of phosphor achieved is highest when x = 0. 1. The results of XRD shows that the phase of YAG doesn＇t change when Gd3＋ doping.