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The luminescence properties of Bi3+‐activated Cs2NaYCl6 crystals are presented. The Bi3+ ion (6s2) occupies an Y3+ site which has cubic symmetry. Excitation in the A absorption band yields 3T1u emission. Excitation in the C absorption band, however, yields 3T1u and 3A1u emission, because both levels are populated by nonradiative processes from the 1T1u excited state. The emission and excitation spectra show vibrational structure. The vibronic lines are assigned and discussed.
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Å. Steen (1980) studied this question.
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