Abstract
Photoluminescence spectrum is a powerful tool to investigate the excitonic and defect-related information in condensed phase materials. Through temperature-dependent photoluminescence spectra, heavy- and light-hole free excitons, and the exciton bound to a neutral donor and the accompanied LO-phonon replicas of the zinc blende ZnSe are observed and verified in ZnSe-based longitudinal twinning nanowires. In the deep-level emission region, two peaks at 1.979 and 2.315 eV are attributed to the donor–acceptor–pair recombination and the acceptor impurity of Au, respectively.
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