In this study, electric conduction of the organic EL device prepared from 8-quinolinol complexes as an emitting layer has been investigated. As the cathode metal with low work function gives the high luminous efficiency, the barrier between the cathode and the electron transport layer controls the electron injection from the cathode. Temperature dependence of current density is very weak and activation energy is independent of electrode materials. Electron injection under high electric field is well explained by tunneling theory. Hopping process is proposed as electron migration. Holes excessively injected from the anode accumulate in the interface between two organic layers and contribute to the enhancement of the electric field at the cathode.
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