Abstract
In this work the influence of sequential isomorphic substitution of Y3+ by Gd3+ on crystal structure, morphology and luminescence spectra of (Y1−x−yGdxYby)3Al5O12 nanocrystals (size 30–40 nm) synthesized via low temperature polymer-salt method was investigated. Prepared nanopowders were studied by XRD, SEM methods of analysis, FT-IR and luminescence spectroscopy. The garnet cubic crystal structure of prepared nanoparticles remains at the replacement of 50% Y3+ by Gd3+ ions. The substitution of Y3+ ions by Gd3+ increases the volume of unit cell of garnet crystals and significantly disorders their crystal structure. It was shown that the controlled partial substitution (up to 50%) of Y3+ ions by Gd3+ in Yb:YAG materials leads to significant broadening of the main emission band of Yb3+ ions (λmax. = 1030 nm) that can be promising for development of ultrashort pulsed laser media.
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