Bi 3+ luminescence in ABiO 2Cl (A=Sr, Ba) and BaBiO 2Br

Abstract

Trivalent bismuth luminescence is reported in three Sillen bismuth oxyhalide phases, SrBiO 2Cl, BaBiO 2Cl, and BaBiO 2Br. These compounds exhibit Bi 6s6p→6s 2 emission under UV and X-ray radiations. At room temperature, BaBiO 2Cl shows the most intense light emission, with spectral and decay properties similar to those found in Bi 4Ge 3O 12 (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, SrBiO 2Cl exhibits faster decays than BGO, while BaBiO 2Cl and BaBiO 2Br have decay times similar to BGO.