Franck-Hertz effect in cathodo- and photoluminescence of wide-gap materials

摘要

A brief overview of previously obtained and novel data on the manifestations of an analogue of Franck-Hertz effect in photo- and cathodoluminescence of wide-gap inorganic materials is presented. On the example of NaCl:Tl~+ and MgO:Cr~(3+) single crystals, the excitation processes of the luminescence of 6s~2 Tl~+ ions and 3d ~3 Cr~(3+) ions by 5-15 keV electrons or 5-20 eV photons at 6-420 K have been studied. The rapid processes of the direct energy transfer to Tl~+ by hot conduction electrons or to Cr~(3+) centers by hot electrons and/or hot valence holes have been separated from rapid excitonic and more inertial electron-hole processes.