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Photoluminescence spectra of ZnO layers obtained by radical-beam epitaxy have been studied. Photoluminescence of free B and C excitons has been observed. At a high excitation level a band with λₘₐₓ=363.1 nm is observed. It is explained in terms of the proposed photoluminescence polariton mechanism in the Bₙ₌₁ exciton spectral region through biexcitons
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Butkhuzi et al. (1998) studied this question.
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