Department of Applied Physics, Indian School of Mines, Dhanbad, 826004, India.
Dalton Trans. 2013 Jul 14;42(26):9654-61. doi: 10.1039/c3dt50780g. Epub 2013 May 16.
A series of CaMoO4 phosphors doped with trivalent dysprosium (Dy(3+)) and codoped with potassium (K(+)) ions were prepared by hydrothermal method. The nanostructures of the as-synthesized phosphors were investigated by X-ray diffraction (XRD). The results reveal that the obtained powder phosphors are single-phase scheelite structure with tetragonal symmetry and the crystallite size is in the range of 10-60 nm. The emission spectra show a bright yellow emission at 576 nm and blue emission at 487 nm. As a charge compensator, K(+) ions were incorporated into CaMoO4:Dy(3+) phosphors, which enhance the PL intensities depending on the doping concentration of K(+). The CIE parameters such as colour coordinates, colour correlated temperature and luminous efficacy of radiation were calculated using spectral energy distribution functions and McCamy's empirical formula. Photometric characterization indicates the suitability of K(+) compensated CaMoO4:Dy(3+) phosphor for white LED applications.
通过水热法制备了一系列掺三价镝（Dy(3+)）和共掺钾（K(+)）离子的 CaMoO4 荧光粉。通过 X 射线衍射（XRD）研究了所合成的荧光粉的纳米结构。结果表明，所得粉末荧光粉为四方相白钨矿结构，具有 10-60nm 的晶粒尺寸。发射光谱在 576nm 处呈现明亮的黄色发射，在 487nm 处呈现蓝色发射。作为电荷补偿剂，K(+)离子掺入到 CaMoO4:Dy(3+)荧光粉中，根据 K(+)的掺杂浓度增强了 PL 强度。使用光谱能量分布函数和 McCamy 的经验公式计算了 CIE 参数，例如色坐标、色相关温度和辐射光效。光度特性表明，K(+)补偿的 CaMoO4:Dy(3+)荧光粉适合用于白色 LED 应用。
