Electrochemical Luminescence of Rare Earth Metal Ion Doped MgIn[sub 2]O[sub 4] Electrodes

Abstract

Anodic dc electrochemical luminescence (ECL) property of nondoped and rare earth (RE) ion-doped electrodes, famous as a transparent electronic conducting material, was investigated. Nondoped and , , , , , and doped , usually exhibiting no or very weak photoluminescence (PL), showed ECL under anodic polarization over . ECL luminescence can be attributed to that from the oxygen defect for nondoped and to that from the doped emission centers (RE ions) for , respectively. Doped RE ions form solid solution within host. From the Rietveld refinement analysis of X-ray patterns, we concluded that RE ions are located at the site in . The ECL intensity dependence on the ion concentration of showed a maximum at and then decreased, whereas PL intensity monotonously increased with increasing concentration. These results suggest that electron conductivity of host are also related with the ECL property.