Bi luminescence in ABiO2Cl (A=Sr, Ba) and BaBiO2Br |
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Authors: | Yetta Porter-Chapman Stephen E. Derenzo |
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Affiliation: | a Department of Functional Imaging, Life Sciences Division, One Cyclotron Road, Berkeley, CA 94720, USA b Materials Science Division, Ernest Orlando Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA |
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Abstract: | Trivalent bismuth luminescence is reported in three Sillen bismuth oxyhalide phases, SrBiO2Cl, BaBiO2Cl, and BaBiO2Br. These compounds exhibit Bi 6s6p→6s2 emission under UV and X-ray radiations. At room temperature, BaBiO2Cl shows the most intense light emission, with spectral and decay properties similar to those found in Bi4Ge3O12 (BGO). At low temperatures, each phase show an increase in the photoluminescence intensities and a narrowing of the emission peaks. In contrast to the temperature dependence of BGO, X-ray excited luminescence intensities of all three phases remain relatively constant throughout the temperature range 10-295 K, though much lower than BGO at low temperatures. This result indicates that the Sillen phases undergo less thermal quenching than BGO. The low temperature and room temperature radio-luminescence decay times were determined from pulsed X-ray measurements. At room temperature, SrBiO2Cl exhibits faster decays than BGO, while BaBiO2Cl and BaBiO2Br have decay times similar to BGO. |
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Keywords: | Scintillator Phosphor Emission Radio-luminescence Photoluminescence Bismuth |
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