Non-radiative De-excitation of Deep Centres
نویسنده
چکیده
We develop a quantitative theory of the ratio R of radiative to non-radiative de-excitation based on the Dexter-Klick-Russell criterion for the occurrence of luminescence. The model invokes three essential elements: a promoting mode, an accepting mode, and a set of lattice modes which ultimately absorb the vibrational energy. The ratio R is determined by the relative population of the relaxed excited and pound states. We show that R n “‘ln,‘“‘. where ni’) and n?’ are the numbers of vibrational quanta in the accepting mode associated with the excite: state and the around state, resoectivelv. at the crossing of their adiabatic potential energy curves. The result is consistent with experiment. . .
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