Abstract
Two single crystals of LGSO containing 1% Dy3+ and differing in Ce3+ concentration were grown by the Czochralski method. XRD examination revealed that a crystal with a nominal Ce3+ concentration of 3% has the C2/c structure inherent to Lu2SiO5 (LSO) whereas a crystal with a nominal Ce3+ concentration of 1% has the P21/c structure inherent to Gd2SiO5 (GSO). In both crystal structure types the excitation of Ce3+ ions is followed by an energy transfer to Dy3+ ions and resulting visible emission consists of a broad-band Ce3+ luminescence and of much more narrow bands of Dy3+ luminescence. Excitation spectra imply that the efficiency of Dy3+ excitation via Ce3+ – Dy3+ energy transfer is markedly higher than upon direct optical pumping into Dy3+ excited levels. It was observed that visible emission in the two systems differs in spectral characteristics, hence in the colour of the emitted light. Examination of optical spectra recorded with a polarized light revealed important anisotropy of transition intensities of Ce3+ ions in LGSO host with the P21/c structure.
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