Journal
JOURNAL OF LUMINESCENCE
Volume 110, Issue 3, Pages 95-99Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2004.04.007
Keywords
fluorides; vacuum ultraviolet (VUV); energy transfer; quantum cutting effect; hydrothermal synthesis
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Eu3+-doped NaGdF4, KGdF4 and NH4GdF4 phosphors with little oxygen contamination have been synthesized by hydrothermal technique. The emission spectra show that the doped Eu3+ ions are located in noncentrosymmetric sites in the three compounds. The two-photon emission has been observed in NaGdF4:Eu3+ and KGdF4:Eu3+ compounds under VUV excitation from the ground states to higher (6)G(J) excited states of Gd3+ ions, while in Eu3+-doped NH4GdF4, emissions from D-5(1,2,3) excited states of Eu3+ cannot be detected in the luminescence spectra. (C) 2004 Elsevier B.V. All rights reserved.
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