Abstract
While examining the optical and electrical properties of field-emission organic light-emitting devices with oxide-coated cathodes as electron sources, this investigation elucidates the mechanism of emission from organic thin films as emission layers. Experimental results indicate that the emission characteristics depended strongly on the device structure. Green emission was observed in a single-layered Alq 3 film. Green emission was also observed from the Alq 3 layer of the multilayered m-MTDATA/NPB/Alq 3 structure. However, the emission efficiency from the multilayered m-MTDATA/NPB/Alq 3 structure significantly exceeded that of the single-layered structure. Electroluminescence is the most likely emission mechanism in these devices.
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