Improvement of metal-organic interface by insertion of mono-layer size insulating layer in organic EL device

Insertion of mono-layer size insulating layer into the cathode/organic and anode/organic layer has been investigated in organic EL device, which consists of 8-hydroxyquinoline aluminum (Alq3) as an emissive layer and diamine (TPD) as a hole transporting layer. The emission characteristics have been improved by insertion of mono-layer size of Al2O3 between electrode and organic layers and the dependence of layer thickness of Al2O3 has been investigated.