Electron and hole intraband luminescence in complex metal oxides

A fast (τ<3 ns) broadband and temperature-independent emission of NaNO3, BaMgAl10O17 and SrMgAl10O17, excited under electron pulse irradiation, is interpreted as intraband luminescence (IBL). A separation of a hole component of the IBL allowed to estimate the width of the valence band in NaNO3, Ev=3.8 eV. The intensity of IBL drastically decreases in the spectral region of 6.3–6.6 and 6.1–6.4 in BaMgAl10O17 and SrMgAl10O17, respectively. This decrease is caused by the lowering of the density of the states at the edges of the valence band and, therefore, provides information on the value of Ev.