Abstract
Reflection and absorption spectra of InBr x I 1- x mixed crystals have been measured at 2 K by using polarized light. The lowest reflection peak shifts continuously from InI to InBr indicating the intra-cationic nature of the first exciton transition. In the absorption spectra of the mixed crystals with low iodine concentration, zero-phonon indirect exciton transition is identified and concentration dependence of its threshold energy is investigated. It is confirmed that the indirect-direct crossover occurs at the composition x =0.5.
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