Zimmermann, Jörg ; Hesse, Sabine ; Schmechel, Roland ; Seggern, Heinz von (2004)
Preparation-induced F-centre transformation in BaFBr:Eu2+.
In: Journal of physics / D, 37 (17)
doi: 10.1088/0022-3727/37/17/002
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In this paper the transformation of one type of photostimulable colour centre (F-centre) into another, depending on the preparation conditions of the storage phosphor BaFBr : Eu2+, is investigated. Despite the fact that the quasi-binary phase diagram of BaF2-BaBr2 shows no detectable solid solution for either BaF2 or BaBr2 in BaFBr, it will be demonstrated that an imbalance induced on purpose in the bromine/fluorine ratio can alter the shape of the stimulation spectrum from F(F−)- to F(Br−)-centres and vice versa in a subsequent annealing process. It will be demonstrated that such an imbalance can be generated by exposing BaFBr : Eu2+ to an alcohol/water solution between a sintering step and an annealing step. Thereby the water dissolves BaFBr by removing BaBr2 from the surface of the grains, leaving an excess of BaF2 behind. Based on these findings a practical synthesis route will be offered, which can lead to improved phosphor properties. Such properties are a macroscopically single phase of BaFBr : Eu2+ without detectable BaF2 or BaBr2 residuals and solely photostimulable F(Br−)-centres.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2004 |
| Autor(en): | Zimmermann, Jörg ; Hesse, Sabine ; Schmechel, Roland ; Seggern, Heinz von |
| Art des Eintrags: | Bibliographie |
| Titel: | Preparation-induced F-centre transformation in BaFBr:Eu2+ |
| Sprache: | Englisch |
| Publikationsjahr: | 18 August 2004 |
| Verlag: | IOP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of physics / D |
| Jahrgang/Volume einer Zeitschrift: | 37 |
| (Heft-)Nummer: | 17 |
| DOI: | 10.1088/0022-3727/37/17/002 |
| URL / URN: | http://iopscience.iop.org/0022-3727/37/17/002/pdf/0022-3727_... |
| Kurzbeschreibung (Abstract): | In this paper the transformation of one type of photostimulable colour centre (F-centre) into another, depending on the preparation conditions of the storage phosphor BaFBr : Eu2+, is investigated. Despite the fact that the quasi-binary phase diagram of BaF2-BaBr2 shows no detectable solid solution for either BaF2 or BaBr2 in BaFBr, it will be demonstrated that an imbalance induced on purpose in the bromine/fluorine ratio can alter the shape of the stimulation spectrum from F(F−)- to F(Br−)-centres and vice versa in a subsequent annealing process. It will be demonstrated that such an imbalance can be generated by exposing BaFBr : Eu2+ to an alcohol/water solution between a sintering step and an annealing step. Thereby the water dissolves BaFBr by removing BaBr2 from the surface of the grains, leaving an excess of BaF2 behind. Based on these findings a practical synthesis route will be offered, which can lead to improved phosphor properties. Such properties are a macroscopically single phase of BaFBr : Eu2+ without detectable BaF2 or BaBr2 residuals and solely photostimulable F(Br−)-centres. |
| Zusätzliche Informationen: | Zeichendarst. im Sacht. teilw. nicht vorlagegemäß wiedergegeben |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Elektronische Materialeigenschaften |
| Hinterlegungsdatum: | 20 Nov 2008 08:19 |
| Letzte Änderung: | 20 Feb 2020 13:25 |
| PPN: | |
| Sponsoren: | The authors would like to acknowledge the financial support given to them (JZ and RK) by the DFG and (MS) by the Forschungszentrum Juelich. |
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