Luminescence and ultraviolet excitation spectroscopy of SrI2 and SrI2:Eu2+

Abstract We report measurements of luminescence and its ultraviolet excitation spectra in SrI 2 and SrI 2 :Eu 2+ at temperatures of 10 and 300 K. Attention is focused on determining the exciton energy and its temperature shift from features of the excitation spectra and limits placed by absorption spectroscopy on a 120 μm thin crystal, on observation of a broadened Eu emission band attributed to trace Eu associated with oxygen in nominally undoped crystals, and on adding observations concerning the 3.4 eV band at low temperature attributed by Pustovarov et al. to the self-trapped exciton.