Abstract
We report the electroluminescence (EL) of organic heterojunction devices based on N,N′-diphenyl-N,N′-bis(3-methylphenyl)-(1,1′-biphenyl)-4,4′,-diamine (TPD) and 2-(4′-biphenyl)-5-(4″-tert-butylphenyl)-1,3,4-oxadiazole (PBD). Besides monomolecular emissions from TPD, there are two additional EL peaks at around 460 and 480nm from the bilayer device indium tin oxide (ITO)/TPD(100nm)∕PBD(45nm)∕Al. Our experimental data confirmed that the EL emission maximized at around 460nm is from electroplex as the result of charge carriers cross recombination at the TPD/PBD interface and the EL emission maximized at around 480nm originates from (TPD*PBD)-type exciplex.
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