| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1889215 | Radiation Measurements | 2007 | 4 Pages |
Abstract
Powder samples of EuAl2O4 and (Eu,Sr)Al2O4 with a quantum efficiency (QE) of the Eu2+ emission more than 0.30 were synthesized. A modified method of QE determination is described and results of the QE measurements for EuAl2O4, (Eu0.8Sr0.2)Al2O4, (Eu0.65Sr0.35)Al2O4, and a diluted sample (Sr0.98Eu0.02)Al2O4 are presented. Excitation and emission spectra as well as decay behaviour of the Eu2+ luminescence in (Eu1-xSrx)Al2O4 in the temperature region of 20-300Â K are studied. It is concluded that the main reason for the high QE is a pronounced relaxation of the crystal lattice after excitation of the Eu2+ ions resulting in an emission with a large Stokes shift and, therefore, in a restriction of energy migration. Eu ions occupying the crystallographic sites with the higher coordination number (EuII) are supposed to be the luminescence centres in (EuSr)Al2O4 lattice.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
F. Meister, M. Batentschuk, S. Dröscher, A. Osvet, A. Stiegelschmitt, M. Weidner, A. Winnacker,