DocumentCode :
1926696
Title :
The conversion of high energy radiation to visible light by luminescent ceramics
Author :
Rossner, W. ; Boldinger, H. ; Leppert, J. ; Grabmaier, B.C.
Author_Institution :
Siemens AG, Munich, Germany
fYear :
1992
fDate :
25-31 Oct 1992
Firstpage :
35
Abstract :
The properties of luminescence ceramics which are roughly based on rare-earth doped oxides, oxysulfides, garnets, and silicates have been investigated. The characteristic luminescence data of the ceramics considered, such as emission spectra and decay, are similar to those of corresponding powders or single crystals. However, conversion efficiency, afterflow, and energy resolution are strongly affected by ceramic processing due to its influence on the microstructure, final optical quality, and defect structure. In this connection residual pores and grain boundaries play an important role. For example, the insufficient optical quality of Gd2O2Sr:Pr,Ce-ceramics is the main reason not only for a reduced light output but also for a rather pronounced degradation of the energy resolution, beyond the merely statistical limit. Consequently, luminescent ceramics, at least in their present form, appear not be suited for spectrometric applications. In the case of scintillation counting, the presented ceramics exhibit rather high decay constants giving low count rates. This drawback can be improved by using activator dopants with faster optical transition
Keywords :
ceramics; garnets; grain boundaries; luminescence of inorganic solids; photoluminescence; Gd2O2Sr:Pr,Ce; afterflow; conversion efficiency; decay constants; energy resolution; garnets; grain boundaries; luminescence ceramics; oxides; oxysulfides; rare-earth doped; silicates; Ceramics; Crystal microstructure; Degradation; Energy resolution; Garnets; Grain boundaries; Luminescence; Powders; Spectroscopy; Stimulated emission;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
Type :
conf
DOI :
10.1109/NSSMIC.1992.301178
Filename :
301178
Link To Document :
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