The emission and reflection spectra of ZnO have been investigated in the intrinsic region and the data have been interpreted in terms of the wurtzite crystal band structure. Free-exciton emission is observed for the first time. Both the Γ₅ and Γ₆ state excitons associated with top valence band have been identified. This identification has established the valence-band symmetry ordering in ZnO.
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Reynolds et al. (1999) studied this question.
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