バリヤー型陽極アルミナ皮膜中の注入ユーロピウムイオンの化学状態

抄録

Display devices of rare-earth metals ion-implanted into an anodic alumina film on aluminum substrate were studied. The red, green and blue color of the electroluminescence can be emitted from the devices of implanted metal ions Eu⁺, Tb²⁺ and Tm²⁺, respectively. A weak blue luminescence is available from Tm²⁺ as a color center. The divalent state of europium ions, which acts as the blue color center, is discussed for the possibility of bright blue luminescence. However, even if Eu⁺ is implanted into the anodic alumina film, only the red luminescence of Eu³⁺ can be observed. The cause of this examined using the results of the DV-Xα computer simulation, XPS and measurement of luminescent spectra. It is suggested that Eu²⁺ can be stable in a columdum structure of alumina. Furthermore, the implanted position was not a vacancy of alumina, but was thought to replace the aluminum atom.