Abstract
Highly efficient field-emission organic light emitting diodes (FEOLEDs) using a dynode structure were successfully fabricated. The inorganic phosphor used to emit light in a field-emission diode (FED) was replaced with an organic electroluminescent (EL) light emitting layer in a FEOLED. A dynode structure is proposed to be used in the FEOLED and its electron amplification ability can enhance the efficiency of a FEOLED. With the dynode-FEOLED structure, the current density is largely improved from 3.5 to 8.5 mA/cm 2 under the same electric field (2.66 V/μm) of the FEOLED and dynode-FEOLED. Bright and uniform emission images are obtained in the dynode-FEOLED. Compared with the FEOLED, the luminance of dynode-FEOLED improves greatly, reaching an eightfold rise to 850 cd/m 2 from 115 cd/m 2 at the same anode voltage (400 V). The dynode-FEOLED also overcomes the emission uniformity problem in the field-emission cathodes consisting of screen-printing carbon nanotubes.
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