Organic Electroluminescence Devices Using Poly(arylene vinylene) Conducting Polymers

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Abstract
An orange electroluminescent (EL) diode utilizing poly(1,4-naphthalene vinylene) (PNV) has been demonstrated for the first time and the EL properties of PNV are discussed in comparison with those of EL diode utilizing poly(p-phenylene vinylene) (PPV). The EL emission of these two devices can be interpreted in terms of radiative recombination of the singlet polaron exciton formed by the injection of electrons and holes. Although the EL intensity of the PNV light-emitting diode is weak compared to that of the PPV diode, orange EL emission was clearly observed under normal room light even at low driving voltage. These results are discussed in terms of the difference in effective conjugation length and the interchain transfer of polaron excitons generated by the injection of electrons and holes.