Optical analysis of the local perturbation in RCOB host lattice doped with europium ion

摘要

New aspects of RCOB structure were obtained from Eu~(3+) absorption/emission spectra in GdCOB and EuCOB host lattices. The spectra of Eu~(3+) in powders and single crystals are comparatively analyzed. The Eu~(3+) spectra show at least three non-equivalent centers whose static spectral characteristics were used to assign structural models. An explanation of the difference between GdCOB: Eu~(3+) and EuCOB spectra in terms of a disordered occupancy of rare earth and calcium sites is given.