Abstract
The F 3+ 3 oxygen-vacancy aggregate in additively colored calcium oxide single crystals is reported to be the first example of a color p-center showing both fluorescence and phosphorescence. Time-resolved experiments yield an upper limit for the rate of intersystem crossing from the fluorescent doublet state to the phosphorescent quartet state of 1.7 × 10 8 s −1. Vibronic structure and temperature behavior of the fluorescence spectrum are analyzed. Local phonon modes coupled with the doublet electronic excited state were found to be ω 1=101 cm −1 and ω 2=134 cm −1.
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