Abstract
Strong and stable blue photoluminescence (PL) from annealed C clusters embedded in SiO 2 (deposited by r.f.-sputtering) was recorded, under excitation power on a scale of μW cm −2. UV PL was also recorded from about half of the annealed samples, but this was not stable — the intensity decayed with time. Carbon and oxygen K-edge XAFS (X-ray absorption fine structure) suggest that (1) the nanoclusters present are C-based materials, (2) the luminescent materials probably involve π bonded carbon. The size distributions of the nanoclusters obtained by TEM suggest that a quantum-confined size effect can also apply to the blue PL.
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