Here we report the observation of ohmic hole injection from a conducting polymer anode into poly(9,9-dioctylfluorene) in a polymer light-emitting diode structure. Although initially nonohmic, the contact can be made locally ohmic by electrically conditioning the device at voltages higher than the electroluminescence onset voltage. The ohmic nature of the contact in selected regions is confirmed by the appearance of dark injection space-charge-limited transient currents, which yield hole mobilities in good agreement with those measured by the time-of-flight method. The appearance of ohmic injection is discussed within a model that assumes the existence of electron traps near the anode interface. When the sample is conditioned electrons are injected from the cathode and are trapped near the anode inducing an interfacial dipole that reduces the barrier for hole injection.
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28 July 2003
Research Article|
July 28 2003
Ohmic hole injection in poly(9,9-dioctylfluorene) polymer light-emitting diodes
D. Poplavskyy;
D. Poplavskyy
Experimental Solid State Group, Department of Physics, Imperial College, Prince Consort Road, London, SW7 2BW United Kingdom
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J. Nelson;
J. Nelson
Experimental Solid State Group, Department of Physics, Imperial College, Prince Consort Road, London, SW7 2BW United Kingdom
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D. D. C. Bradley
D. D. C. Bradley
Experimental Solid State Group, Department of Physics, Imperial College, Prince Consort Road, London, SW7 2BW United Kingdom
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Appl. Phys. Lett. 83, 707–709 (2003)
Article history
Received:
March 07 2003
Accepted:
June 09 2003
Citation
D. Poplavskyy, J. Nelson, D. D. C. Bradley; Ohmic hole injection in poly(9,9-dioctylfluorene) polymer light-emitting diodes. Appl. Phys. Lett. 28 July 2003; 83 (4): 707–709. https://doi.org/10.1063/1.1596722
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