
Decay times of the green luminescence of U6+ in oxides with perovskite structure are reported. The influence of the site symmetry is found to be considerable. The temperature dependence of the decay time gives evidence for a coupling of the electronic transition with a phonon of about 200 cm−1 in the excited state. The results show the emission to originate from a parity-forbidden transition, vibronically allowed by coupling with vibrations of ungerade symmetry.
Scheikunde
Scheikunde
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