SPECTROSCOPIC CHARACTERISTICS, MAGNETIC-PROPERTIES AND FLUORESCENCE DYNAMICS OF TM3+ IN YVO4 CRYSTAL

Based on the analysis of the group-chain scheme, the crystal-field-lev el fitting has been carried out for Tm3+:YVO4, in which the Tm3+ ions occupy D-2d site symmetry positions. The RMS of energy-level fitting i s 7.00 cm(-1). The wavefunctions obtained were used to the study of ma gnetic, thermal and spectroscopic properties of the crystal. The calcu lated g-factors confirm Karayianis' partial g-sum rule. The temperatur e dependence of Schottky specific heat and magnetic susceptibility agr ees well with the experimental data. Using the Judd-Ofelt parameter an alysis, the Omega(lambda) parameters are fitted to the absorption spec tra with Omega(2) = 7.85, Omega(4) = 4.74, and Omega(6) = 0.071 (in 10 (-20) cm(2)). Considering the radiative, nonradiative transition and c ross-relaxation (H-3(4), H-3(6) -> 2(3)F(4)) in Tm3+:YVO4, one set of rate equations is established to study the fluorescence dynamics. The relation between the ion's population density in the excited state and the doped ion concentration is discussed, and some useful inferences are drawn.