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New emission lines from Eu3+ centers aside from the main broad-band emission from Eu2+ in CaS-doped EuF3 were found at 10 K. The intensity of these emission lines increases after annealing in a mixed gas of Ar and O2. The origin of the emission might be related to interstitial O2- or F-.
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Fukumoto et al. (1993) studied this question.
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