Ivan Franko National University of Lviv, Lviv, Ukraine.
J Phys Condens Matter. 2010 Dec 8;22(48):485503. doi: 10.1088/0953-8984/22/48/485503. Epub 2010 Nov 17.
LiYP(4)O(12) polyphosphate doped with Ce(3+) ions was prepared by the melt solution technique. The crystal structure, interatomic distances, and atom coordination numbers were determined using x-ray powder diffraction. A study of the spectral-kinetic luminescent properties was performed employing excitation with pulsed radiation from a synchrotron (UV-VUV range) and a laboratory x-ray source. The characteristics of Ce(3+) luminescence, namely the emission doublet maxima at 3.97 and 3.72 eV and the 4f-5d excitation maxima at 4.20, 5.11, 5.40, 5.65 and 6.55 eV, are discussed in terms of crystal field splitting in a low-symmetry site of the LiYP(4)O(12) host lattice. The location of the Ce(3+) energy levels with respect to the valence and conduction bands of the LiYP(4)O(12) host is estimated from the temperature dependence of the decay time measured for Ce(3+) 5d-4f luminescence.
掺铈的 LiYP(4)O(12)多磷酸盐通过熔融溶液技术制备。采用 X 射线粉末衍射法确定晶体结构、原子间距离和原子配位数。利用同步加速器（UV-VUV 范围）和实验室 X 射线源的脉冲辐射激发，对光谱动力学发光性质进行了研究。根据 LiYP(4)O(12)基质晶格中低对称位置的晶体场分裂，讨论了 Ce(3+)发光的特征，即 3.97 和 3.72 eV 的发射双峰最大值和 4.20、5.11、5.40、5.65 和 6.55 eV 的 4f-5d 激发最大值。根据 Ce(3+) 5d-4f 发光衰减时间随温度的变化，估算了 Ce(3+)能级相对于 LiYP(4)O(12)基质价带和导带的位置。
