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P‐162: Carrier Injection Mechanism in a Mixed Single Layer Organic Light Emitting Device

Injection properties of electrons and holes in a small organic light emitting device with a mixed single organic layer were investigated by current vs voltage measurements using Au/MoO3 and Al alloy as an electron and hole injection electrodes, respectively. On the basis of the temperature dependence of currents through the interface between electrodes and mixed single organic layer, the carrier injection mechanism at the interface was primarily ascribed to the Schottky thermionic emission with the barrier height of 0.25 eV and 0.67 eV for holes and electrons, respectively. It was found that the barrier height of the electron could be controlled by changing LUMO level of mixed organic materials. The interfacial state analysis demonstrated that the electron barrier height was also dependent on the interfacial conditions of the devices.