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Published September 1, 1983 | Published
Journal Article Open

Energy and phase relaxation of phosphorescent F centers in CaO


In this paper we study the temperature‐induced homogeneous broadening of the no‐phonon line in the emission spectrum of the F center in CaO. The linewidth can be fitted to n(n+1), where n is the thermally averaged occupation number of phonons with a frequency of 90 cm^(−1). The results are characteristic of elastic scattering of pseudolocalized phonons at the defect site. These phonons also appear to dynamically couple the Jahn–Teller components of the F center in the photoexcited^3 T_(1u) state and thus give rise to a temperature dependence of the lifetime of this phosphorescent state. Finally, from experiments using laser‐selective excitation it is concluded that the zero‐phonon emission peaking at 571.1 nm does not originate in the F center.

Additional Information

© 1983 American Institute of Physics. Received 02 February 1983 Accepted 05 May 1983. We wish to thank the National Science Foundation (Grant No. DMR 8105034) and the John van Geuns fonds for the partial support of this work. Two of us (M. G. and A.H. Z.) would also like to acknowledge a NATO Research Grant (No. 046.82).

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