Abstract
A good quality(5 at.％Yb∶GdScO3)single crystal of Φ30 mm × 37 mm was grown successfully by the Czochral-ski method.Its structure is studied by the x-ray diffraction(XRD),and its atomic coordinates are obtained by Rietveld refinement.The crystal field energy level splitting of Yb3+in GdScO3 is determined by employing the absorption and photoluminescence spectra at 8 K.Only 2F7/2(4)is far from the ground state 2F7/2(1)by 710 cm-1 among the crystal field energy levels split from 2F7/2,so it is more easier to realize the laser operation of 2F5/2(1)→2F7/2(4)with wavelength 1060 nm.The spin-orbit coupling parameters and intrinsic crystal field parameters(CFPs).The intrinsic crystal field pa-rameters Bk(k=2,4,6)of the crystal were fitted by the superposition model.The CFPs evaluated with Bk and coordination factor are taken as the initial parameters to fit the crystal field energy levels of the crystal,and the crystal field parameters Bqk are obtained finally with the root-mean-square deviation 9 cm-1.It is suggested that the ligand point charge,covalency and overlap interaction are slightly weaker than charge interpenetration and coulomb exchange interaction for Yb3+in GdScO3.The obtained Hamiltonian parameters can be used to calculate crystal field energy levels and wave functions of Yb∶GdScO3 to analyze the mechanism of the luminescence or laser.
万方数据