Abstract

We have computed the transmittances of four types of cathode—Yb∕Au, Al∕Au, Yb∕Ag, and Al∕Ag double layers—and the light extraction efficiencies of the top-emission organic light-emitting diodes with these cathodes, respectively, based on the characteristic matrix method and the dissipation spectrum model. Computations show that the Yb∕Au cathode has a markedly higher transmittance than the other three types of cathode when the Yb and Au thicknesses in the Yb∕Au cathode are, respectively, equal to the Al (or Yb) and Au (or Ag) thicknesses in the other three types of cathode. The power lost to the Yb∕Au cathode due to the surface plasmon polaritons is the lowest, and hence the device with the Yb∕Au cathode has the highest extraction efficiency. The transmittances for the four cathodes are also measured experimentally.

© 2006 Optical Society of America

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