Luminescence and phonon side band analysis of Eu3+-doped lead fluorosilicate glasses

• Published in: Optical materials Vol. 62; pp. 139 - 145
• Main Authors: Manasa, P., Jayasankar, C.K.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2016
• Subjects: Eu3+ glasses; Judd-Ofelt theory; Phonon side band; Photoluminescence; Silicate glasses; Judd-Ofelt theory; Phonon side band; Eu3+ glasses; Silicate glasses; Photoluminescence
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2016.09.006

Lead fluorosilicate (SPbKNLFEu) glasses doped with different concentrations of Eu3+ ions have been prepared by the melt quenching technique. The structural and spectroscopic analysis have been carried out by Raman, absorption, excitation, emission, phonon side band (PSB) spectra and decay time measurements. The Judd-Ofelt theory has been used to predict the radiative properties for the emission levels of Eu3+ ions. Local structure around the Eu3+ ions and the phonon energy of SPbKNLFEu glasses have been confirmed on the basis of PSB associated with the 7F0 → 5D2 transition. The decay curves of the 5D0 and 5D1 levels exhibit single exponential nature with a lifetime of 2240 μs and 20 μs, respectively. The multiphonon relaxation rates (Wmp) from the excited levels to the next lower level of Eu3+ ions have been calculated. The higher stimulated emission cross-section and the strong red emission at 613 nm corresponding to the 5D0 → 7F2 transition suggests that the present lead fluorosilicate glasses could be useful for the optical display devices. The figure shows the emission spectra of SPbKNLFEu glass for different concentrations of Eu3+ ions. Among all these transitions, 5D0 → 7F1 and 5D0 → 7F2 transitions are more intense than the other four transitions. The 5D1 → 7F1 emission transition of green emission band at 536 nm has been observed in the low phonon energy of the host glasses. The phonon energy of 953 cm−1 in the present SPbKNLFEu10 glass is lower than the phonon energy of other reported glasses in the present work. [Display omitted] •Eu3+-doped lead fluorosilicate glasses have been prepared and characterized.•Absorption and photoluminescence spectra and lifetimes have been measured and analyzed.•Phonon energy (953 cm−1) of the glass has been estimated by analyzing PSB and PEB spectra.•Decay curves for 5D0 and 5D1 levels are found to be single exponential for all the Eu3+ ions.•The Experimental Lifetimes evaluated for the 5D0 and 5D1 levels comparable to the theoretical values.