Abstract
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.
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