Abstract
Anodic alumina films with uniformly distributed self assembled pores of diameters in the nanometric length scale were prepared by dual step anodization technique in oxalic, phosphoric and sulphuric acid medium. The variations of pore morphology and photoluminescent properties were studied with respect to the change in electrolytic medium. The photoluminescence (PL) spectra of the films prepared in different electrolytic medium have been recorded and compared. The PL spectra of the porous anodic alumina (PAA) film prepared in oxalic acid was found to be much stronger than the PAA prepared in phosphoric and sulphuric acid. However, pore size of the PAA films prepared in oxalic and sulphuric acid were significantly smaller than the PAA films prepared in phosphoric acid medium. Presence of oxygen deficient defect centre exerts a strong influence on the PL properties of the films.
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