Photoluminescence properties of anodic alumina for application in optical sensors using SERS

The results of optical properties study of porous aluminum oxide films, fabricated by anodizing in a water solution of a sulfuric acid and modified by thermal annealing on air at temperature T ≥800°C are reported. On the basis of the comparative analysis of the received data it is shown that a photoluminescence in near UV and visible regions for aluminum oxide anodized in a sulfuric acid solution originates from the divacancies of oxygen (F 2 , F + 2 and F 2+ 2 centers) and sulfates - ions do not render essential influence on luminescent properties AOA in researched spectral area. For samples annealed at T = 1300 °C, intensive narrow strips determined *see abstract on paper* by the radiative transitions ( 2 E → 4 A 2 ) in ions of Mn4+ (678 nm) and Cr 3+ (694 nm), replacing ions of Al 3+ in octahedral positions of α-Al 2 O 3