Abstract
An efficient emissive site has been investigated by inserting a monolayer size porphine layer (TPP) as a marker in an organic electroluminescent (EL) device consisting of 8-hydroxyquinoline aluminium as an emissive layer and diamine derivative (TPD) as the hole transporting layer. Emissions from and TPP have been observed from the device and the emission intensity from the TPP has been noted to change depending on the distance between the hetero-interface and the inserted site. Emission from the marker layer shows its highest intensity at a position 7 nm from the interface of and TPD. The result also shows that the hetero-interface is not the highest emissive site, but a site several nanometres inside the emissive layer shows the highest emission intensity. The mechanism of emissive recombination has been investigated in an EL device with an emissive layer and a carrier transporting layer.
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