ELECTRONIC EXCITATIONS IN CRYSTALS WITH COMPLEX OXYANIONS

Luminescence excitation spectra of a wide variety of undoped and doped (by rare-earths or transition elements) crystals with alkali-earth cations and complex oxyanions, either octahedral (ZrO32−, CeO32−) or tetrahedral (SO42−, WO42−, PO43−), have been measured using synchrotron radiation of the "Siberia-1" storage ring in the energy range of exciting photons of several bandgaps (up to 35 eV). An attempt is made to work out a uniform approach to the treatment of luminescence excitation of such systems based on the common tendencies observed in the measured spectra. © 1990 IOP Publishing Ltd.