While examining the optical and electrical properties of field emission organic light emitting 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 Alq3 film. Green emission was also observed from the Alq3 layer of the multilayered m-MTDATA/NPB/Alq3 structure. However, the emission efficiency from the multilayered m-MTDATA/NPB/Alq3 structure significantly exceeded that of the single-layered structure. Electroluminescence (EL) is the most likely emission mechanism in these devices.
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