Abstract
In this paper, we examined the effect of post-packaging annealing
on the performance of organic light-emitting diodes containing tris-(8-hydroxyquinoline)
aluminum (Alq3) or
2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) in direct contact with
a LiF-Al bilayer cathode. The detailed electroluminescent (EL) characteristics
were compared before and after annealing at 70 °C for 5 hrs. It was found that better
luminous efficiency as well as greater power efficiency could be achieved
for devices with BCP/LiF/Al structure. However, other devices consisting of Alq3/LiF/Al were
less affected. It is believed that the thermal treatment helps to enhance
the electron injection for the former, and less helpful for the latter.
© 2006 IEEE
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