Spectroscopic investigations and luminescence spectra of Sm~(3+) doped soda lime silicate glasses
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：R.K. Singh S.S.L. Surana Y.K. Sharma
Key words：rare earth glasses; Judd-Ofelt theory; absorption spectroscopy; luminescence;
Abstract: Sm3+ doped soda lime silicate glasses co-doped with As_2O_3 were prepared and characterised by measuring their absorption spectra in UV-VIS/NIR regions and luminescence spectra in the visible region. Judd-Ofelt intensity parameters, Ω_λ, were evaluated from the measured intensifies of the various absorption bands. Ω_λ parameters of these glasses were compared with the Ω_λ parameters of other reported Sm~(3+) glasses to study the bonding environment surrounding the Sm~(3+) in the present glasses. Presence of [AsO_4]_3- tetrahedra in the second coordination sphere around the central Sm3+ ion made these glasses less covalent as compared to other oxide glasses but the ratio Ω_4/Ω_6 of the～1.83 indicated them to be fairly stable. With the help of Ω_λ parameters and luminescence data for various emission lines, radiative properties for different emission lines were calculated. The values of radiative properties indicated that ~4G_(5/2)→~6H_(7/2) and ~4G_(5/2)→~6H_(9/2) transitions responsible for orange luminescence might be used in the development of materials for LED's and other optical devices in the visible region.
R.K. Singh1，S.S.L. Surana2，Y.K. Sharma1
(1.Department of Physics, Govt. Post Graduate College, Rudrapur 263153 (U S Nagar;
2.Department of Physics, J. N. V. University, Jodhpur-342001, India)
Abstract:Sm3+ doped soda lime silicate glasses co-doped with As_2O_3 were prepared and characterised by measuring their absorption spectra in UV-VIS/NIR regions and luminescence spectra in the visible region. Judd-Ofelt intensity parameters, Ω_λ, were evaluated from the measured intensifies of the various absorption bands. Ω_λ parameters of these glasses were compared with the Ω_λ parameters of other reported Sm~(3+) glasses to study the bonding environment surrounding the Sm~(3+) in the present glasses. Presence of [AsO_4]_3- tetrahedra in the second coordination sphere around the central Sm3+ ion made these glasses less covalent as compared to other oxide glasses but the ratio Ω_4/Ω_6 of the～1.83 indicated them to be fairly stable. With the help of Ω_λ parameters and luminescence data for various emission lines, radiative properties for different emission lines were calculated. The values of radiative properties indicated that ~4G_(5/2)→~6H_(7/2) and ~4G_(5/2)→~6H_(9/2) transitions responsible for orange luminescence might be used in the development of materials for LED''s and other optical devices in the visible region.
Key words:rare earth glasses; Judd-Ofelt theory; absorption spectroscopy; luminescence;
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