Abstract
The temperature dependence of the decay time (τ) of the luminescence pulses from the 440 nm emission band as well as the rise time (τ R) of luminescence pulses from the 575 nm emission band has been investigated for KI : In by pulsed light excitation in the A absorption band. From the agreement of τ and τ R independent of the temperature it can be concluded that the X minimum on the 3T 14 adiabatic potential energy surface (APES) is mainly populated by a radiationless transition from the tetragonal T minimum of the same APES. Furthermore, a comparison of parameters for the impurity centre luminescence corresponding to the tetragonal emission band in KI : In and KI : Tl has been drawn.
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