Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 587, Issue -, Pages 90-98Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.10.106
Keywords
Glasses; Rare earth ions; Local structure; Spectroscopic methods
Categories
Funding
- National Science Centre (Poland) [2011/01/B/ST5/00978]
- project DoktoRIS - Scholarship program for innovative Silesia
- European Union under the European Social Fund
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Lead-gallium phosphate glasses doped with rare the earth ions (Eu3+, Dy3+, Tb3+, Er3+) were synthesized. The structure of obtained glasses was examined by means of use: X-ray diffraction (XRD), nuclear magnetic resonance (Pb-207 and P-31 NMR), fourier transform infrared (FT-IR) and Raman spectroscopy. In contrast to fully amorphous Ln-doped samples (Ln = Eu, Dy, Tb), in Er-doped sample the GaPO4 crystalline phase was identified. It was found from the NMR, FT-IR and Raman spectroscopic techniques that, different structural phosphate groups were present in lead phosphate glasses. Based on absorption measurements, the UV-VIS cut-off wavelength for lead phosphate glass was determined and its value is close to 305 nm. Excitation and emission spectra of rare earths were also detected. From excitation spectra of Eu3+ the electron-phonon coupling strength and phonon energy of the glass host were determined. Due to 4f(6)-4f(6) (Eu3+), 4f(8)-4f(8) (Tb3+), 4f(9)-4f(9) (Dy3+) and 4f(11)-4f(11) (Er3+) electronic transitions of trivalent rare earth ions several luminescence bands were stated. (C) 2013 Elsevier B.V. All rights reserved.
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