Synthesis and functionality of the storage phosphor BaFBr:Eu{sup 2+}
- Department of Electronic Materials, Institute of Materials Science, Darmstadt University of Technology, Petersenstrasse 23, 64287 Darmstadt (Germany)
- Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)
- Department of Dispersive Solids, Institute of Materials Science, Darmstadt University of Technology, Petersenstrasse 23, 64287 Darmstadt (Germany)
The present paper relates to a method for synthesizing the photostimulable storage phosphor BaFBr:Eu{sup 2+} that features high stimulation characteristics for use in image plates. All previous synthesis routes consist of a multistep process whereas the presented route is a one-step synthesis. Starting compounds are BaCO{sub 3}, NH{sub 4}F, and NH{sub 4}Br, as well as EuF{sub 3} where the ammonium compounds are highly volatile at temperatures below 300 deg. C. Their reaction products initiate the decomposition of BaCO{sub 3} and form BaFBr. The incorporation of F-centers and europium ions occurs at temperature exceeding 550 deg. C. The individual reaction steps are monitored by simultaneous thermal analysis (thermogravimetry/differential thermal analysis) and the gaseous reaction products are detected by in situ mass spectroscopy. Intermediate and final products are characterized by x-ray diffraction techniques to determine the involved phases. Photoluminescence spectra reveal the typical emission peak of Eu{sup 2+} accompanied by a redshifted emission band at 470 nm, which was assigned to oxygen incorporated into the BaFBr lattice. The synthesized powders exhibit small grain sizes well suited for the use in image plates.
- OSTI ID:
- 21190084
- Journal Information:
- Journal of Applied Physics, Vol. 105, Issue 6; Other Information: DOI: 10.1063/1.3086648; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AMMONIUM FLUORIDES
BARIUM BROMIDES
BARIUM CARBONATES
BARIUM FLUORIDES
DECOMPOSITION
DIFFERENTIAL THERMAL ANALYSIS
EUROPIUM FLUORIDES
EUROPIUM IONS
F CENTERS
GRAIN SIZE
MASS SPECTROSCOPY
OXYGEN
PHOSPHORS
PHOTOLUMINESCENCE
POWDERS
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION