Structural and luminescence behavior of lead fluoroborate glasses containing Eu(3+) ions

Structural and luminescence behavior of lead fluoroborate glasses prepared with the chemical composition (50-x)B(2)O(3) + 20PbO + 20PbF(2) + 10ZnO+xEu(2)O(3) (where x=0.05,0.1,0.5, 1,2 and 3 in wt%) have been studied by varying the trivalent europium ion content. Structural behavior of the prepared...

Full description

Saved in:
Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2013-05, Vol.416, p.88-100
Main Authors: Arunkumar, S, Venkata Krishnaiah, K, Marimuthu, K
Format: Article
Language:English
Subjects:
Condensed matter
Decay
Estimates
Europium
Excitation
Glass
Luminescence
Stimulated emission
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Structural and luminescence behavior of lead fluoroborate glasses prepared with the chemical composition (50-x)B(2)O(3) + 20PbO + 20PbF(2) + 10ZnO+xEu(2)O(3) (where x=0.05,0.1,0.5, 1,2 and 3 in wt%) have been studied by varying the trivalent europium ion content. Structural behavior of the prepared glasses has been explored through XRD, FTIR and Raman spectral analysis. Optical characterization has been made using UV-vis-NIR absorption, excitation, luminescence and decay curves of the present glasses. Through the absorption spectra, bonding parameters ( beta and delta ) have been determined and the positive value of delta indicates the covalent nature. The band gap values are found to decrease with increasing Eu(3+) ion concentration whereas Urbach's energy values are found to increase. The PSB associated with the (7)F(o) arrow right (5)D(2) excitation transition is used to determine the electron-phonon coupling constant and the local structure of the Eu(3+) ions with its surrounding ligands. The luminescence intensity ratio of the (5)D(0) arrow right (7)F(2) to (5)D(0) arrow right (7)F(1) transition has been calculated to estimate the local site symmetry around the Eu(3+) ions. Judd-Ofelt (J-O) intensity parameters Omega ( lambda )( lambda =2,4,6) were obtained from the emission spectra and the same is used to estimate the transition probability (A), stimulated emission cross-section ( sigma (P)(E)) and branching ratios ( beta (R)) for the excited levels of the Eu(3+) ions. The decay profiles were found to be single exponential for all the title glasses. The higher values of A, sigma (P)(E) and beta (R) corresponding to the (5)D(0) arrow right (7)F(2) emission level at 614 nm confirm the potential of the present glasses as a red laser active medium.
ISSN:0921-4526
DOI:10.1016/j.physb.2013.02.022