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
J. X. Sun, X. L. Zhu, X. M. Yu, H. J. Peng, M. Wong, and H. S. Kwok, "Improving the Performance of Organic Light-Emitting Diodes Containing BCP/LiF/Al by Thermal Annealing," J. Display Technol. 2, 138-142 (2006)