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Electrochemical luminescence (ECL) at n-type ZnO semiconductor electrode was measured under anodic polarization. Scanning the potential imposed on the ZnO electrode, emission was suddenly observed around +20V. Using the ZnO electrodes doped with rare earth metal ions as Sm3+, Eu3+, Dy3+, Ho3+ and Er3+, much brighter emission was obtained than the ECL of non-doped ZnO. These emission spectra are ascribed...