Institute of Optical Communication Materials, South China University of Technology, Guangzhou, People's Republic of China.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Oct 15;77(3):638-42. doi: 10.1016/j.saa.2010.07.001. Epub 2010 Jul 13.
Polycrystalline Ca(7)Mg(2)P(6)O(24):Eu(2+),Mn(2+) phosphors were prepared by a solid-state reaction under a weak reductive atmosphere. The phosphors have been characterized by X-ray diffraction and fluorescence measurements. The results show that the obtained phosphors are of single-phase rhombohedral Ca(7)Mg(2)P(6)O(24). Upon excitation of 355nm ultraviolet (UV) light, two intense broad bands have clearly been observed due to the allowed 5d-4f transition of Eu(2+) and the forbidden (4)T(1)-(6)A(1) transition of Mn(2+), respectively. A white light has been obtained from Ca(7)Mg(2)P(6)O(24):0.035Eu(2+),0.5Mn(2+) phosphor with CIE chromaticity coordinates of (x=0.32, y=0.29) and color temperature of 6175K. These results suggest that Ca(7)Mg(2)P(6)O(24):Eu(2+),Mn(2+) phosphors could be a promising candidate for UV-converting white light-emitting diodes (LEDs).
多晶 Ca(7)Mg(2)P(6)O(24):Eu(2+),Mn(2+) 荧光粉通过弱还原气氛下的固态反应合成。通过 X 射线衍射和荧光测量对荧光粉进行了表征。结果表明，所获得的荧光粉为单相菱面体 Ca(7)Mg(2)P(6)O(24)。在 355nm 紫外 (UV) 光激发下，由于 Eu(2+)的允许 5d-4f 跃迁和 Mn(2+)的禁戒 (4)T(1)-(6)A(1)跃迁，分别清楚地观察到两个强宽的带。通过 Ca(7)Mg(2)P(6)O(24):0.035Eu(2+),0.5Mn(2+) 荧光粉获得了白光，其 CIE 色度坐标为 (x=0.32, y=0.29)，色温为 6175K。这些结果表明，Ca(7)Mg(2)P(6)O(24):Eu(2+),Mn(2+) 荧光粉可能是用于 UV 转换白光发光二极管 (LED) 的有前途的候选材料。
