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We report observation of fast and efficient VUV/UV luminescence from the mixed (Ba,La)F 2 :Er crystals. The broad bands, peaking at 162.5, 181.9, 194.2, 202.8, 216.1, 233.5 and 281.5nm and decaying, at 10 and 293K, with time constants of 46 and 35ns respectively, are due to spin-allowed transitions from the low-spin (LS) state of the 4f 10 5d configuration.We also observed a weak and...
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