GdxY(2-x)O3:Eu^3+荧光粉的制备及其荧光性能

Preparation and fluorescence properties of GdxY(2-x)O3:Eu^3+ phosphors

为了提高红色荧光粉的发光强度和量子效率,采用水热法制备复合基质GdxY(2-x)O3:Eu^3+荧光粉。首先对制备出的Y2O3:Eu^3+和Gd2O3:Eu^3+荧光粉进行发光强度分析,得到稀土基质离子和Eu^3+的最佳掺杂比例;在此基础上制备GdxY(2-x)O3:Eu^3+荧光粉,研究不同的x值对GdxY(2-x)O3:Eu^3+荧光粉的晶体结构、表面形貌、发光强度及量子效率的影响。采用X射线衍射仪、场发射扫描电镜和荧光光谱仪等对样品进行表征。结果表明:选用稀土基质离子和Eu^3+的最佳掺杂比例为25∶1时制备的复合基质GdxY(2-x)O3:Eu^3+荧光粉,在x为0.5时,该荧光粉的发光强度和量子效率均达到最大值。与Y2O3:Eu^3+荧光粉对比,发光强度提高57.22%,量子效率提高90.20%;与Gd2O3:Eu^3+荧光粉对比,发光强度提高21.29%,量子效率提高46.93%。

In order to improve the photoluminescence intensity and quantum efficiency of the red phosphors, the composite matrix GdxY(2-x)O3:Eu^3+ phosphor was prepared by hydrothermal method. Firstly, the photoluminescence intensity of Y2O3:Eu^3+ and Gd2O3:Eu^3+ phosphors prepared was analyzed to obtain the optimum doping ratio of rare earth matrix ions and Eu^3+. On this basis, GdxY(2-x)O3:Eu^3+ phosphors were prepared and the effects of different x values on the crystal structure, surface morphology and photoluminescence intensity of GdxY(2-x)O3:Eu^3+ phosphors were studied. The samples were characterized by X-ray diffractometer(XRD), field emission scanning electron microscopy(FE-SEM) and photoluminescence spectroscopy(PL). The results show that when the optimal doping ratio of rare earth ions and Eu^3+ is 25∶1, the composite matrix GdxY(2-x)O3:Eu^3+ phosphors are prepared. When x is 0.5, the photoluminescence intensity and quantum efficiency of GdxY(2-x)O3:Eu^3+ phosphors reach the maximum. Compared with Y2O3:Eu^3+ phosphors, the photoluminescence intensity increased by 57.22%, and the quantum efficiency increased by 90.20%. Compared with Gd2O3:Eu^3+ phosphors, the photoluminescence intensity increased by 21.29% and the quantum efficiency increased by 46.93%.