The luminescence and absorption spectra of gadolinium—gallium (Gd3Ga5O12), yttrium—gallium (Y3Ga5O12), gadolinium—scandium—aluminum (Gd3Sc2Al3O12), and yttrium—aluminium (Y3Al5O12) garnet single crystals, doped with Er3+ ions (the Er2+ concentration varies from 0.1 to 40 wt%) are investigated at 4.2 and 77 K. The Stark component level schemes for the above-mentioned single crystals are constructed. Two types (N and A) of Er3+ activator centres with greatly differing structures of the crystalline environment are revealed in the spectra of 4I15/2 ⇄ 4I13/2 transitions in Gd3Ga5O12 and Y3Ga5O12 crystals. The interaction of these centres at low temperatures are observed. The reason of these effects is discussed.
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Ашуров et al. (1976) studied this question.
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