Luminescence properties of tunable red-green emitting phosphor Ba2Ca(BO3)2:Eu3+, Tb3+

A series of Eu3+ or Tb3+ doped Ba2Ca(BO3)2 phosphors were synthesized by a high temperature solid state method, and the luminescence properties are investigated. Ba2Ca(BO3)2:Tb3+ can show an obvious green emission, and the peak locates at 551 nm, which corresponds to the 5D4→7F5 transition of Tb3+. Ba2Ca(BO3)2:Eu3+ can present the characteristic emission of Eu3+, and the peak locates at 600 nm, which is ascribed to the 5D0→7F2 transition of Eu3+. In order to achieve the emission-tunable phosphors, the Eu3+/Tb3+ co-doped Ba2Ca(BO3)2 are synthesized. When tuning the Eu3+ or Tb3+ concentration, Ba2Ca(BO3)2:Eu3+, Tb3+ can both show the tunable emission, which may be induced by the energy transfer from Tb3+ to Eu3+.     

紫外高光谱探测仪实验室辐照度定标研究

紫外高光谱探测仪在轨运行时通过地球光观测光路和太阳光观测光路获取辐射和光谱信息, 因此在发射前需 对载荷进行实验室定标。定标后获取的辐照度定标系数将用于在轨计算获取反演所需的太阳参考谱, 定标精度直接 影响仪器在轨探测及数据反演精度, 决定着获取的遥感信息的可靠性。采用直接发散光辐照度定标方法, 搭建二维定 标平台对定标光路进行不同角度、距离的标准灯测试, 将三个距离下的实验值借助最小二乘法线性拟合得到辐照度 定标系数, 并对系数进行角度等因素的校正。测试结果表明合成不确定度为 3.42%, 符合辐射定标要求, 表明了方法的 可行性。