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Luminescence properties of bipolar stylbeneamine–quinoxalines

2008; Elsevier BV; Volume: 31; Issue: 2 Linguagem: Inglês

10.1016/j.optmat.2008.05.001

1873-1252

Gabriel Bernardo, M. Alexandra Esteves, Ana M. G. Guerreiro, Bárbara Gigante, Jorge Morgado,

Synthesis and Biological Evaluation

Novel electroluminescent materials combining three functionalities were used as active layers in light-emitting diodes. These functionalities are brought about by the presence of three moieties: diphenylstylbeneamines, for hole transport, quinoxaline, for electron-transport, and a dehydroabietic acid methyl ester, to prevent crystallisation. The devices prepared with these materials and with magnesium cathodes show efficiencies up to 0.03 cd/A, which is about one order of magnitude higher than the efficiency obtained with the related diphenylstylbeneamines.