Organic Electroluminescent Devices Using a Polymer Hole Transport Material

초록

Poly[N-(p-diphenylamine)phenyl methacrylamide] (PDPMA) was prepared for a polymer hole transport material in the multilayered organic electroluminescent (EL) device. 2-(4'-tert-butylphenyl)-5-(4 ''-biphenyl)-1,3,4-oxadiazole (PBD) and 1,1,4,4,-tetraphenyl-1,3-butadiene (TPB) were used as an emitting layer and an electron transport layer, respectively. PDPMA showed better thermal and electrochemical properties than poly( N- vinylcarbazole) (PVK), or low molecular weight material, triphenylamine (TPA). MgAg/PBD/TPB/PDPMA/ITO device emitted blue light with high brightness (350 cd/m(2)) at a drive voltage of 8 V. The stability and luminescent properties were improved by PDPMA than PVK or TPA.

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