Effect of Anodizing Medium on The Morphology and Photoluminescent Property of Porous Alumina Film

Anodic alumina films with uniformly distributedself assembled pores of diameters in the nanometric length scalewere prepared by dual step anodization technique inoxalic, phosphoric and sulphuric acid medium. The variationsof pore morphology and photoluminescent properties werestudied with respect to the change in electrolyticmedium. The photoluminescence (PL) spectra of the filmsprepared in different electrolytic medium have been recordedand compared. The PL spectra of the porous anodic alumina(PAA) film prepared in oxalic acid was found to be muchstronger than the PAA prepared in phosphoric and sulphuricacid. However, pore size of the PAA films prepared in oxalicand sulphuric acid were significantly smaller than the PAAfilms prepared in phosphoric acid medium. Presence of oxygendeficient defect centre exerts a strong influence on the PLproperties of the films