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Quenching of thermo-stimulated photo-ionization by energy transfer in CaAl4O7: Tb, Ce |
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| Authors: | D. Jia W. Jia X.-J. Wang |
| Affiliation: | a Department of Physics, University of Puerto Rico, Mayaguez, PR 00681, USA b Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA c Department of Physics, Georgia State University, Statesboro, GA 34610, USA |
| Abstract: | Crystal fibers of Ce3+ and Tb3+ singly doped and co-doped CaAl4O7 were grown by the LHPG method. Photoluminescence, excitation spectra and photoconduction were measured. Thermo-stimulated photo-ionization (delocalization) of electrons from the lowest field component of the 5d excited state of Ce3+ was observed in the Ce3+ singly doped sample under excitation at 355 nm. The 5d sublevel was found to locate at 0.3 eV below the conduction band of the host. However, the thermo-stimulated photo-ionization was greatly quenched due to the fast energy transfer from the 5d sublevel to Tb3+ ions in the Ce3+/Tb3+ double doped sample. |
| Keywords: | 78.55.&minus m |
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