Switching of the hole injection barrier in blue polymer light-emitting diodes

Teunis van Woudenbergh; Paul W. M. Blom

doi:10.1117/12.546039

8 September 2004 Switching of the hole injection barrier in blue polymer light-emitting diodes

Proceedings Volume 5464, Organic Optoelectronics and Photonics; (2004) https://doi.org/10.1117/12.546039
Event: Photonics Europe, 2004, Strasbourg, France

Abstract

The contact energy barrier of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonic acid) (PEDOT:PSS) on poly(9,9-dioctylfluorene) (PFO) amounts to 1 eV, resulting in a hole injection current that is reduced by 6-7 orders of magnitude. However, upon electrical addressing it is demonstrated that the hole contact barrier completely vanishes, resulting in an Ohmic contact. Furthermore, a change of the built-in electric field has been observed with two different techniques. The shift of the built-in electric field is in agreement with a charge dipole layer that reduces the injection energy barrier for the PEDOT:PSS/PFO contact.

Citation Download Citation

Teunis van Woudenbergh and Paul W. M. Blom "Switching of the hole injection barrier in blue polymer light-emitting diodes", Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); https://doi.org/10.1117/12.546039

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