对Er3+/Tm3+/Yb3+共掺杂BaGa2ZnO5粉末的上转换发光特性进行了研究。首先, 通过不同的制备工艺研究了BaGa2ZnO5粉末的生成条件。XRD分析表明, 由于ZnO的高温分解, 必须密封烧结并增加ZnO用量才能制备出BaGa2ZnO5。其次, 测量了Er3+/Tm3+/Yb3+共掺杂BaGa2ZnO5粉末在980 nm LD激发下的上转换发射光谱, 发现存在8个较强上转换发射峰, 其中480 nm和798 nm对应于Tm3+离子能级跃迁, 其他上转换峰对应于Er3+离子能级跃迁。另外, 测量了980 nm LD不同激发功率对应的上转换发射峰强度, 并根据激发功率-上转换强度曲线拟合得到了各发射峰对应的多光子吸收过程。最后, 根据上转换发射光谱和CIE 1931标准数据计算了样品粉末的色坐标为(x=0.415 1, y=0.479 4), 比较接近白光色坐标, 说明所制备的粉末样品具有产生上转换白光的前景。

Upconversion luminescence performance of BaGa2ZnO5 powder codoped with Er3+/Tm3+/Yb3+ was studied. Firstly, the preparation condition of BaGa2ZnO5 powder was researched through different preparation technology. XRD analysis proves that BaGa2ZnO5 must be prepared in sealed environment and with more ZnO due to the phrolysis of ZnO. There are eight emission peaks in the upconverted emission spectrum of BaGa2ZnO5∶Er3+/Tm3+/Yb3+ powder excited by 980 nm LD, thereinto, 480 nm and 798 nm peaks correspond to energy level transition of Tm3+ ions, and other emission peaks correspond to energy level transition of Er3+ ions. Moreover, the upconverted emission intensities under different exciting power were measured, and the multiple-photon absorption process of each emission peaks was obtained through fitting curve of exciting power-upconversion intensity. At last, the color coordinate of the sample powder was calculated according to the upconversion emission spectrum and standard data of CIE 1931. The color coordinate is (x=0.415 1, y=0.479 4) and is close to the color coordinate of white light. It proves that the prepared sample powder has the application prospect in the field of white luminescence.