Abstract
Nanocrystalline Y1 − x − y Gd x Eu y PO4 phosphors have been prepared via precipitation from aqueous solutions. From their luminescence and excitation spectra, the intensity ratio I 615/I 594 of the Eu3+ luminescence bands corresponding to electric dipole and magnetic dipole transitions has been determined as a function of Gd3+ content. The critical concentration and effective energy transfer radius in Y1 − x − y Gd x Eu y PO4 have been evaluated. Excitation of Gd3+8 S J −6 D J and 8 S J −6 J J transitions to Eu3+ luminescence excitation levels in Y0.99 − x Gd x Eu0.01PO4 involves efficient energy transfer. Under 250-nm excitation, the Eu3+ luminescence yield in Y0.99 − x Gd x Eu0.01PO4 is a factor of 2.5–3 higher than that in Y0.99Eu0.01PO4.
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Original Russian Text © Yu.N. Savvin, N.V. Babayevskaya, S.S. Oleinik, O.N. Bezkrovnaya, A.V. Tolmachev, 2009, published in Neorganicheskie Materialy, 2009, Vol. 45, No. 4, pp. 473–477.
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Savvin, Y.N., Babayevskaya, N.V., Oleinik, S.S. et al. Luminescent properties of europium-activated yttrium gadolinium phosphates. Inorg Mater 45, 423–427 (2009). https://doi.org/10.1134/S0020168509040177
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DOI: https://doi.org/10.1134/S0020168509040177