Shalapska T, Stryganyuk G, Demchenko P, Voloshinovskii A, Dorenbos P
Physics Department, Ivan Franko National University of Lviv, 8 Kyryla i Mefodiya Street, 79005 Lviv, Ukraine.
J Phys Condens Matter. 2009 Nov 4;21(44):445901. doi: 10.1088/0953-8984/21/44/445901. Epub 2009 Oct 9.
Luminescent-kinetic studies for LiY(0.9)Ce(0.1)P(4)O(12), LiGd(0.9)Ce(0.1)P(4)O(12) and NaGd(0.9)Ce(0.1)P(4)O(12) phosphates which were prepared by the melt solution technique have been performed using synchrotron radiation excitation within 3-12.4 eV energy range and x-ray radiation at T = 10-300 K. The [Formula: see text] transfer at 10 K and bidirectional [Formula: see text] mechanisms of energy transfer at 300 K have been revealed based on the analysis of the excitation spectra and decay kinetic measurements of Ce(3+) luminescence. The participation of the Gd sublattice in the energy migration process to the Ce(3+) centers causes the appearance of a slow component in the decay kinetics of the x-ray-excited luminescence pulse. The luminescence efficiency of LiY(0.9)Ce(0.1)P(4)O(12), LiGd(0.9)Ce(0.1)P(4)O(12) and NaGd(0.9)Ce(0.1)P(4)O(12) upon x-ray excitation at room temperature is discussed.
采用熔体溶液技术制备了LiY(0.9)Ce(0.1)P(4)O(12)、LiGd(0.9)Ce(0.1)P(4)O(12)和NaGd(0.9)Ce(0.1)P(4)O(12)磷酸盐，并在3 - 12.4 eV能量范围内利用同步辐射激发以及在T = 10 - 300 K下利用X射线辐射进行了发光动力学研究。基于对Ce(3+)发光的激发光谱和衰减动力学测量的分析，揭示了10 K时的[公式：见原文]转移以及300 K时能量转移的双向[公式：见原文]机制。Gd亚晶格参与向Ce(3+)中心的能量迁移过程，导致X射线激发发光脉冲的衰减动力学中出现慢成分。讨论了室温下X射线激发时LiY(0.9)Ce(0.1)P(4)O(12)、LiGd(0.9)Ce(0.1)P(4)O(12)和NaGd(0.9)Ce(0.1)P(4)O(12)的发光效率。
