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Published May 24, 1999 | Published
Journal Article Open

Organic light-emitting diode with 20 lm/W efficiency using a triphenyldiamine side-group polymer as the hole transport layer


We have used triphenyldiamine side-group polymers as hole transport layers in multilayer organic light-emitting diodes using 8-hydroxyquinoline aluminum (Alq_3) as an emission layer. The device efficiency systematically increases as the ionization potential of the hole transport layer is shifted further from the work function of the indium–tin–oxide anode. We attribute this trend to better balance of hole and electron charges in the device. An optimized device consisting of a fluorinated version of the polymer as the hole transport layer, quinacridone doped Al as the emission layer, and a LiF/Al cathode results in a peak external luminous efficiency of 20 lm/W.

Additional Information

© 1999 American Institute of Physics. Received 12 February 1999; accepted for publication 24 March 1999. The authors acknowledge support from the MURI Center for Advanced Multifunctional Nonlinear Optical Polymers and Molecular Assemblies (CAMP) funded by ONR, from NSF, and an AASERT student support through Grant No. BMDO/AFOSR.

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August 19, 2023
October 24, 2023