Appleby, G. A. ; Kroeber, P. ; Zimmermann, J. ; Seggern, H. von (2011)
Influence of oxygen doping and hydration on photostimulated luminescence of CsBr and CsBr:Eu2+.
In: Journal of Applied Physics, 109 (7)
doi: 10.1063/1.3569745
Article, Bibliographie
Abstract
Powdered samples of CsBr:O2− and CsBr:Eu2+,O2− with oxygen concentrations ranging from 0.01 to 5.00 mol% have been synthesized and are shown to have photostimulated luminescence (PSL) properties which are strongly influenced by the oxygen concentration. In europium free CsBr:O2−, it was found that weak PSL emission at 460 nm arises from oxygen impurities while with oxygen concentrations higher than 0.05 mol% the emission shifts to the 379 nm emission of the CsBr matrix, which is attributed to the nonexcitability of oxygen agglomerates. The F-center concentration in CsBr:O2− is observed to increase with oxygen concentration, due to an increase in Br-vacancies as charge compensation centers for the O2− ions. In all CsBr:Eu2+ samples studied, intense PSL emission arises only following room temperature hydration in an atmosphere of 99% relative humidity, and it is concluded that the presence of water molecules is essential for the PSL in CsBr:Eu2+. In CsBr:Eu2+,O2− this enhancement effect of PSL intensity is reduced as the oxygen concentration increases above 0.05 mol% due to competition between the Eu2+ and O2− luminescence centers. It was found that the effects of hydration can be partially reversed following exposure to a vacuum while the material is rendered completely PSL inactive following thermal annealing up to 600 °C which is caused by agglomeration of the highly mobile Eu2+ ions and subsequent loss of Eu2+ luminescence.
| Item Type: | Article |
|---|---|
| Erschienen: | 2011 |
| Creators: | Appleby, G. A. ; Kroeber, P. ; Zimmermann, J. ; Seggern, H. von |
| Type of entry: | Bibliographie |
| Title: | Influence of oxygen doping and hydration on photostimulated luminescence of CsBr and CsBr:Eu2+ |
| Language: | English |
| Date: | 1 April 2011 |
| Publisher: | AIP Publishing LLC |
| Journal or Publication Title: | Journal of Applied Physics |
| Volume of the journal: | 109 |
| Issue Number: | 7 |
| DOI: | 10.1063/1.3569745 |
| Abstract: | Powdered samples of CsBr:O2− and CsBr:Eu2+,O2− with oxygen concentrations ranging from 0.01 to 5.00 mol% have been synthesized and are shown to have photostimulated luminescence (PSL) properties which are strongly influenced by the oxygen concentration. In europium free CsBr:O2−, it was found that weak PSL emission at 460 nm arises from oxygen impurities while with oxygen concentrations higher than 0.05 mol% the emission shifts to the 379 nm emission of the CsBr matrix, which is attributed to the nonexcitability of oxygen agglomerates. The F-center concentration in CsBr:O2− is observed to increase with oxygen concentration, due to an increase in Br-vacancies as charge compensation centers for the O2− ions. In all CsBr:Eu2+ samples studied, intense PSL emission arises only following room temperature hydration in an atmosphere of 99% relative humidity, and it is concluded that the presence of water molecules is essential for the PSL in CsBr:Eu2+. In CsBr:Eu2+,O2− this enhancement effect of PSL intensity is reduced as the oxygen concentration increases above 0.05 mol% due to competition between the Eu2+ and O2− luminescence centers. It was found that the effects of hydration can be partially reversed following exposure to a vacuum while the material is rendered completely PSL inactive following thermal annealing up to 600 °C which is caused by agglomeration of the highly mobile Eu2+ ions and subsequent loss of Eu2+ luminescence. |
| Uncontrolled Keywords: | annealing, caesium compounds, charge compensation, doping profiles, europium, F-centres, impurities, oxygen, photoluminescence, powders, solvation, vacancies (crystal) |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Electronic Materials 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 14 Oct 2013 09:18 |
| Last Modified: | 14 Oct 2013 09:18 |
| PPN: | |
| Funders: | The authors would like to acknowledge financial support from the Deutsche Forschungsgemeinschaft (DFG). |
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