アルミニウムの含Eu³⁺イオン水溶液での交流陽極酸化中の桃色発光

抄録

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.