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Trivalent bismuth luminescence is reported in three Sillen bismuth oxyhalide phases, SrBiO 2 Cl, BaBiO 2 Cl, and BaBiO 2 Br. These compounds exhibit Bi 6s6p→6s 2 emission under UV and X-ray radiations. At room temperature, BaBiO 2 Cl shows the most intense light emission, with spectral and decay properties similar to those found in Bi 4 Ge 3 ...
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