Low-energy charge transfer excitations in NiOстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:Comparative analysis of photoluminescence (PL) and photoluminescence excita-
tion (PLE) spectra of NiO poly- and nanocrystals in the spectral range 2-5.5 eV reveals two PLE bands peaked near 3.7 and 4.6 eV with a dramatic rise in the low-temperature PLE spectral
weight of the 3.7 eV PLE band in the nanocrystalline NiO as compared with its polycrystalline
counterpart. In frames of a cluster model approach we assign the 3.7 eV PLE band to the
low-energy bulk-forbidden p-d (t1g()-e g) charge transfer (CT) transition which becomes the
allowed one in the nanocrystalline state while the 4.6 eV PLE band is related to a bulk allowed d-d (e g-e g) CT transition scarcely susceptible to the nanocrystallization. The PLE spectroscopy of the nanocrystalline materials appears to be a novel informative technique for inspection of different CT transitions.