Abstract
Anodic oxide films formed on aluminium in lower aliphatic carboxylic acids exhibit self-colouring of yellow through brown, and characteristic properties such as photoluminescence (PL), electroluminescence (EL), and electron spin resonance (ESR). These phenomena are closely associated with the carboxylate species incorporated in the oxide during anodization1. Although the presence of incorporated carboxylate species in some cases2,3 and their distribution in oxalic acid film have been established4, there have been little data available on the state of incorporated impurities in the oxide. We have studied the distributions of coloured material and PL centres in the oxide and report here that most of the coloured material is located in the outer region of the cell walls of an oxalic acid film, but that the PL centres are in the middle region and have different properties from those of the outer region. These results suggest that the incorporated impurities which are present in the various states in oxide have to be converted during anodization.
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Yamamoto, Y., Baba, N. & Tajima, S. Coloured materials and photoluminescence centres in anodic film on aluminium. Nature 289, 572–574 (1981). https://doi.org/10.1038/289572a0
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DOI: https://doi.org/10.1038/289572a0
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