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Spectroscopic investigation of samarium‐doped lead oxyflouroborate glasses using photo and cathode luminescence
Author(s) -
Othman Hosam A.,
Elkholy Hagar S.,
Hager Ibrahim Z.
Publication year - 2017
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.12259
Subject(s) - samarium , materials science , luminescence , ion , analytical chemistry (journal) , photoluminescence , polarizability , doping , stark effect , absorption spectroscopy , absorption (acoustics) , absorption edge , cathode , quenching (fluorescence) , electric field , optics , inorganic chemistry , band gap , fluorescence , chemistry , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics , composite material , molecule
Samarium‐doped lead oxyflouroborate glasses of 60 B 2 O 3 ‐ xPbO‐ (40‐x)LiF where (x=0‐30 mol%) with 3×10 20 ions/cm 3 of Sm 2 O 3, were prepared by melt quenching. UVVis absorption, photo luminescence (PL) and cathode luminescence (CL) spectroscopies were used to study the effect of varying PbO content on the spectroscopic properties of these samarium‐doped glasses. The absorption of the UV‐edge shifts toward higher wavelengths, not only because of higher polarizability of lead ions, but also because of the strong allowed s‐p transition of Pb 2+ . Judd‐Ofelts parameters were determined and indicate that the asymmetry around Sm 3+ ions increases with increasing PbO content. Ω 2 probes the asymmetry by the ratio of intensity of the hypersensitive transition ( 6 H 9/2 ) to that of purely magnetic ( 6 H 5/2 ) transition. Furthermore, an increase in the spectroscopic quality factor (Ω 4 /Ω 6 ) was observed with increasing PbO content which indicates that these glasses have the potential to be used as efficient active laser glasses. The calculated energy transfer parameter increases with increasing PbO content. Also, stark splitting increases with increasing PbO concentrations. FWHM of the CL emission peaks and stark splitting, are found to be much larger than that in PL. This was explained by the high electric field generated from the exciting electron pulses.