Abstract
Aluminum doped zinc oxide (ZAO) is presented in this letter as an alternative transparent electrode: optimized ZAO films offer excellent parameters for organic light emitting diodes (OLEDs). The ZAO films are applied to various p-i-n-type OLEDs. By using green phosphorescent molecules in a double emitter structure, very high efficiencies were obtained, namely, 54.6cd∕A and 61.5lm∕W for 100cd∕m2 at 2.78V. Additionally, white OLEDs on ZAO demonstrated pure white emission independent of the luminance and high efficiencies of 12.6cd∕A and 14.5lm∕W for 100cd∕m2 at 2.6V, which is comparable to indium-tin-oxide based white OLEDs.
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