Abstract
F centers have no luminescence in some crystals. This occurs only in cases intermediate between the adiabatic and the nonadiabatic limits, when we adopt a reasonable damping rate of the configuration coordinate whose oscillation is triggered by photon excitation at an energy E. When ( EE 1) E 1 > 1 − 4Λ , with E 1 absorption-peak energy, the luminescence quantum efficiency decreases steeply. Here Λ S/E 1 represents Bartram and Stoneham's parameter with S lattice-relaxation energy. Otherwise, the nonradiative de-excitation requires a thermal activation, but the activation energy is much smaller than that required at thermal equilibrium.
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