Luminescence properties of bipolar stylbeneamine-quinoxalines
- G. Bernardo ; M.A. Esteves; A. M. Guerreiro; B.G. Gigante; Morgado, J.;
Optical Materials
Vol.
31
, No.
2
, pp.
320
-
327
,
October
,
2008
.
ISSN (print): 0925-3467
ISSN (online): 0925-3467
Journal Impactor Factor: 1.714 (in 2008)
Abstract
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
