Abstract
Experiments carried out with G. Baur, L. Mader and P. Thoma have shown the existence of a strong release from traps due to tunneling at liquid helium temperature. The tunneling is connected with emission of photons and causes an afterglow which is observable up to hours („tunnel-afterglow”). This emission shows a red-shift compared with the usual thermal activated phosphorescence because the transitions take place not from the edge of the conduction band but directly from the trap levels. This mechanism of trap emptying has considerable consequences for the interpretation of glow-curves below 100 °K.
Continuous or quasi-continuous trap depth distribution is much more revealed in phosphors of the ZnS-type than it was believed before. The trap depth distribution over the energy scale can be directly determined from the hyperbolic decay curves which are valid over broad decay periods at constant temperature.
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Riehl, N. (1968). Neue Ergebnisse über Elektronentraps und “Tunnel-Nachleuchten” in ZnS. In: Madelung, O. (eds) Festkörper Probleme 8. Advances in Solid State Physics, vol 8. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0109172
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DOI: https://doi.org/10.1007/BFb0109172
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