CROSSLUMINESCENCE OF KF AND RELATED-COMPOUNDS

The luminescence of KF, KMgF//3, KCaF//3 and solid solutions KF-RbF was studied under excitation with 6 keV electron pulses. Electronic transitions from the F** minus 2p valence band to the K** plus 3p core band result in a specific 'crossluminescence' in the 6-9 eV region with decay time less than 2 ns. In the KF-RbF solid solutions the transitions from the F** minus 2p valence band to the Rb** plus 4p localized states or to the corresponding impurity band gives rise to luminescence bands at 5. 4 and 6. 1 eV as in pure RbF.