Luminescence of Eu ion in alumina prepared by plasma electrolytic oxidation

Obtained Eu-doped coatings were studied using luminescence methods. Typical Eu ion luminescence bands were observed, however intensity and spectral distribution differs drastically depending on preparation method and parameters used, therefore the Eu ion luminescence could be used as coating quality luminescent probe. Additionally, the possibility to incorporate the Eu ions in trivalent or divalent state exhibiting bright red and blue luminescence accordingly was demonstrated by using different oxidation parameters. Moreover, comparison measurements between powder samples and coatings were made.