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We demonstrate an inverted top-emitting organic light-emitting diode using a transparent silver oxide anode formed by oxygen plasma treatment. The turn-on voltage decreased from 22 to 12 V, and the luminance increased from 175 to at as the Ag anode was treated by plasma. The measurement of synchrotron radiation photoelectron spectroscopy and ultraviolet photoelectron spectroscopy revealed that the Ag changed and the work function was increased by 0.45 eV during plasma treatment. The lowered the injection barrier for holes, enhancing the electroluminescent properties.
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Hong et al. (2007) studied this question.
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