Abstract
Single crystal of Gd3Ga3Al2O12 (GGAG) doped with 1 at.% Sm3+ was fabricated by the Czochralski method. Optical absorption and emission spectra as well as luminescence decay curves for this crystal was recorded at different temperatures ranging from 5 K to 300 K. The energies of the crystal field sublevels of selected multiplets were determined based on optical spectra recorded at T = 5 K. It has been found that widths of emission spectral lines related to transitions between individual crystal field levels of multiplets are stable up to 100 K, then new Stark component of higher the 4G5/2 multiplets starts to appear in the spectrum. The spectral widths (FWHM) are in the range 7–30 cm−1 what is caused with solid solution composition of the crystal. Five local positions of the Sm3+ have been found in this material. Judd-Ofelt calculation of branching ratios has been done. The color of luminescence is orange-red with CIE coordinates as x = 0.606 and y = 0.393 and the total efficiency 45%.
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