Abstract
Abstract Photoluminescence (PL) is studied in a-C:H as a function of excitation energy Eex and optical gap. The PL spectrum is a broad peak whose energy increases then saturates with increasing Eex because of the presence of wide tails of localized states. The relative quantum efficiency does not sharply decrease for Eex above the optical gap, indicating that the mobility edges lie well above the optical band edges. The PL shows polarization memory, indicating that PL occurs from highly localized anisotropic centres, with the depolarization rate related to the Urbach energy. The results are consistent with PL occurring by the excitation and recombination of electron-hole pairs within π bonded clusters.
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