Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 15, Issue 12, Pages 2071-2079Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/15/12/324
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Porous anodic alumina (PAA) films with ordered nanopore arrays have been prepared by electrochemically anodizing aluminium in oxalic acid solutions, and the role of the oxalic impurities in the optical properties of PAA films has been discussed. Photoluminescence (PL) measurements show that the PAA films obtained have a blue PL band with a peak position at around 470 nm; the oxalic impurities, incorporated in the PAA films during the anodization processes and already existing in them, could be being transformed into PL centres and hence responsible for this PL emission.
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