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Accession Number:
ADP011901
Title:
Energy Transfer Processes in (Lu,Gd)AlO3:Ce
Descriptive Note:
Conference proceedings
Corporate Author:
NICHOLAS COPERNICUS UNIV OF TORUN (POLAND) INST OF PHYSICS
Report Date:
2001-01-01
Pagination or Media Count:
5.0
Abstract:
In this paper we present initial results of studies on energy transfer processes in Ce-activated Lu, Y and Gd aluminum perovskite crystals that contribute to production of scintillation light in these new scintillator materials. In particular we report and analyze emission spectra, excitation spectra, and emission time profiles under pulsed synchrotron excitation in the wavelength range of 50-300 nm. The emission spectra of Lu0.65Gd0.35AlO3Ce and Lu0.2Y0.8AlO3Ce display a characteristic double band that is due to the spin-orbit split d-f transition of Ce3 with no indication of Gd3 f-f emissions in the Gd-containing crystal. Nevertheless the time-gated and integrated excitation spectra of Ce-emission of this crystal in addition to the f-d Ce3 bands reveal some additional fine features, absent in the Y-containing crystal, that are evidently related to the f-f transitions at Gd3 ions. We also observe that the Ce-emission time profile measured under direct Ce-excitation displays fast decaying component while the Gd-tuned excitation produces slow profiles that resemble those observed under gamma or X-ray excitation. These results directly prove that slow scintillation components characteristic of the LuxGd1-xAlO3Ce scintillator are due to transfer of energy that was originally deposited by the ionizing radiation in the Gd-sublattice of the crystal.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
