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Luminescence from BaFCl, BaFBr and their mixtures BaFCl 1-x Br x has been investigated under VUV excitation with synchrotron radiation at temperatures 11-200 K. In BaFCl, two emission bands are found to appear at 5.36 eV and 3.37 eV, which presumably originate from self-trapped excitons (STE) situating in the on- and off-center configurations with the Cl 2 - core...
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