<p>PURPOSE: An organic light emitting device is provided to improve a driving voltage property and a power efficiency property by increasing the work function of a first electrode to reduce a hole injection barrier. CONSTITUTION: In an organic light emitting device, a first electrode(5) is formed on a substrate(1). The first electrode comprises a first element - containing zinc oxide film. A first layer(6) including the cyano group - containing compound is formed on the first electrode. An organic layer(7) is formed on the first layer. A second electrode(9) is formed on the organic layer.</p>
