Optical spectroscopy, thermal quenching and electron-vibrational interaction of the octahedrally coordinated Eu super(2+) ion in SrAl sub(2)B sub(2)O sub(7)

The spectroscopic properties of the six-fold (octahedral) coordinated Eu super(2+) in SrAl sub(2)B sub(2)O sub(7) have been investigated. Relevant optical parameters such as the Stokes shift, crystal-field splitting, the centroid shift and the red-shift of the Eu super(2+) 4f super(6)5d super(1) ele...

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Bibliographic Details
Published in:Journal of luminescence 2014-07, Vol.151, p.256-260
Main Authors: Camardello, S J, Toscano, P J, Brik, M G, Srivastava, A M
Format: Article
Language:English
Subjects:
Centroids
Electronics
Fluid flow
Luminescence
Optical properties
Quenching
Spectroscopy
Splitting
Online Access:Get full text
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Summary:The spectroscopic properties of the six-fold (octahedral) coordinated Eu super(2+) in SrAl sub(2)B sub(2)O sub(7) have been investigated. Relevant optical parameters such as the Stokes shift, crystal-field splitting, the centroid shift and the red-shift of the Eu super(2+) 4f super(6)5d super(1) electronic configuration have been estimated from the experimental data. Further, the Huang-Rhys factor and the effective phonon energy, which are responsible for electron-vibrational interactions are theoretically estimated for the Eu super(2+) ion in SrAl sub(2)B sub(2)O sub(7). The low quenching temperature of the luminescence is connected with the thermally induced photoionization of the Eu super(2+) 4f super(6)5d super(1) electron. A cross-cutting comparative study of the optical properties of octahedrally coordinated Eu super(2+) in SrAl sub(2)B sub(2)O sub(7) and in Cs sub(2)M super(2+)P sub(2)O sub(7) (M super(2+)=Ca super(2+), Sr super(2+)) is also presented.
ISSN:0022-2313
DOI:10.1016/j.jlumin.2014.02.029