Pink Electroluminescence during AC Anodizing of Aluminum in Aqueous Solution Containing Eu3+ Ion

Pink light emission from the Al electrode has been observed during AC anodizing at 10∼60Hz, 50∼65V of Al in aqueous solutions containing Eu3+ ion. The emission peaks at 590, 612, 653, 703nm were assigned respectively to the 5D0-7F1, 5D0-7F2, 5D0-7F3 and 5D0-7F4 transitions of the Eu3+ activator, and...

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Bibliographic Details
Published inHyōmen gijutsu Vol. 43; no. 3; pp. 221 - 224
Main Authors MIZUKI, Issei, MORISAKI, Shigeyoshi, BABA, Nobuyoshi
Format Journal Article
LanguageEnglish
Japanese
Published Tokyo The Surface Finishing Society of Japan 01.03.1992
Hyomen Gijutsu Kyokai
Japan Science and Technology Agency
Subjects
Anodic Al2O3 Film
Electroluminescence
Eu3+ Activation
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Summary:Pink light emission from the Al electrode has been observed during AC anodizing at 10∼60Hz, 50∼65V of Al in aqueous solutions containing Eu3+ ion. The emission peaks at 590, 612, 653, 703nm were assigned respectively to the 5D0-7F1, 5D0-7F2, 5D0-7F3 and 5D0-7F4 transitions of the Eu3+ activator, and appeared only during cathodic half periods. It is concluded that the pink emission is electroluminescence caused by the excitation of cathodically injected Eu3+ accompanying hydrogen evolution due to the electrolytic rectification into the thin barrier Al2O3 layer to which high electric field was applied.
ISSN:0915-1869
1884-3409
DOI:10.4139/sfj.43.221