Lu3Al5O12：Ce3+超细粉体的制备及其性能研究

在LuAG：Ce3+闪烁陶瓷的制备中，粉体的性能对陶瓷的透明度有重要影响，提出了采用满足透明陶瓷闪烁体需求的Lu3Al5O12：Ce3+（LuAG：Ce3+）超细粉体制备方法。以CeO2，Lu2O3为原料，NH4HCO3为沉淀剂，聚乙二醇（PEG200）为分散剂，采用共沉淀法在一定温度下灼烧制备Lu3Al5O12：Ce3+（LuAG：Ce3+）超细粉体。通过X射线衍射分析（XRD）、荧光分光光度计（PL）和扫描电子显微镜（SEM）等表征样品的结构与性能。研究分散剂、不同Ce3+掺杂浓度、烧结温度对晶相形成和发光性能的影响。共沉淀法制备粉体的工艺简单，所需烧结温度较低，得到粉体粒径小。结果表明，加入分散剂后的前驱体在1300℃下煅烧2h获得的粉体颗粒均匀，相纯度高，分散性好，制备的LuAG：Ce3+粉体在460nm的蓝光激发下发出505nm的绿光。

Preparation and Luminescence Properties of Lu3Al5O12:Ce3+Ultrafine Powders

The properties of LuAG:Ce3+ powders have an important effect on the transparency of ceramics,which uses a method to prepare Lu3Al5O12:Ce3+(LuAG:Ce3+)ultrafine powders which satisfy the demands of transparent ceramic scintil-lator. Lu3Al5O12:Ce3+ultrafine-powders were prepared by co-precipitation method,CeO2 and Lu2O3 were used as original materials,NH4HCO3 as the precipitant,and polyethylene glycol(PEG200)as the dispersant,then sintered at a certain tem-perature. The structure and properties of the samples were analyzed by X-ray diffraction (XRD),fluorescence spectro-photometer and scanning electron microscope (SEM). It has researched the effect of dispersant,different Ce3+-doped concentrations and sintering temperatures on the crystal phase and luminous intensity of the phosphors.The preparation of co-precipitation is simple,needs lower sintering temperature and the particle size of powder is small. The results il-lustrates that the samples with dispersant calcines at 1300℃ for 2h has an uniform distribution, high purity and good dispersibility. Under the 460nm UV-light excited, the powders which has a broadband green emitting at the peak of 505nm.