Intraband Luminescence in Ionic Crystals

Abstract

Abstract Time‐resolved luminescence spectra of CsI, NaI, α‐Al 2 O 3 , and AgBr are investigated under sub‐ nanosecond electron pulse excitation. New intrinsic emission bands with a decay time less than 20 ps are revealed. It is proposed that the fast emission components originate from hot carrier intraband radiative transitions. The intraband luminescence spectra and light output are temperature independent and are not affected by crystal impurities. The correlation between the intraband luminescence spectra and crystal band structure is discussed.