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N. V. BABAEVSKA, A. S. KRYZHANOVSKA, Yu. N. SAVIN, and A. V. TOLMACHOV
«Phosphors Based on Rare-Earth Phosphates Activated with Lanthanides Ions »
PACS numbers: 61.72.Hh, 68.37.Lp, 78.60.-b, 81.07.Wx, 81.40.Tv, 81.70.Jb, 82.80.Ej
Phosphors based on polycrystalline and nanocrystalline complexes of rare earth phosphates are obtained using precipitation from aqueous solution with microemulsion and subsequent ultrasonic treatment. Depending on co-activator (Gd3?) content, the transformation of crystal lattice from monazite to xenotime takes place. Introduction of co-activator (Gd3?) and activator (Eu3?) permits to control spectral composition from orange colour to red one of emission and increase the luminescence efficiency. Microemulsion method allows to control size and form of nanocrystals. As shown, size and shape of the objects influence on the luminescence of activator. As concluded, in nanosized matrices, the concentration of localization sites of europium ions increases in low-symmetry positions relative to central ion in comparison with GdPO4:Eu3? polycrystals.