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Luminescence properties of bipolar stylbeneamine-quinoxalines

Bernardo , G. ; Esteves, M.A. ; Guerreiro, A. M. ; Gigante, B.G. ; Morgado, J.

Optical Materials Vol. 31, Nº 2, pp. 320 - 327, October, 2008.

ISSN (print): 0925-3467
ISSN (online):

Journal Impact Factor: 1,714 (in 2008)

Digital Object Identifier: 10.1016/j.optmat.2008.05.001

Novel electroluminescent materials combining three functionalities were used as active layers in lightemitting
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