Electrochemically doped polymeric anode for improving the performance of molecular organic light-emitting diodes
- 16 June 2003
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 82 (25) , 4587-4589
- https://doi.org/10.1063/1.1586784
Abstract
The doping level of spin-coated poly(ethylenedioxythiophene):poly(styrenesulfonate) (PEDT:PSS) films was adjusted quantitatively by an electrochemical doping/dedoping process in toluenesulfonic acid containing solution. The increase in doping level leads to an improvement of hole injection from the PEDT:PSS/ITO (indium–tin oxide) anode to the hole transporting layer, which is attributed to the enhanced work function of PEDT. The performance of vapor-deposited tri(8-hydroxyquinoline) aluminum ( Alq 3 ) based organic light-emitting devices with these anodes is shown to depend strongly on the doping level of PEDT:PSS. The device, built on a highly oxidized anode by electrochemical modification (electrochemical equilibrium potential of 0.59 V vs Ag/AgCl), shows a reduction of the operating voltage by 2 V, as well as remarkable enhancement of the luminance compared to the device on a pristine polymeranode.Keywords
This publication has 11 references indexed in Scilit:
- Improved hole injection and performance of multilayer OLED devices via electrochemically prepared-polybithiophene layersJournal of Materials Chemistry, 2002
- Molecular organic light-emitting diodes using highly conducting polymers as anodesApplied Physics Letters, 2002
- Hole injection barriers at polymer anode/small molecule interfacesApplied Physics Letters, 2001
- Determination of the emission zone in a single-layer polymer light-emitting diode through optical measurementsJournal of Applied Physics, 2001
- PEDT/PSS for efficient hole-injection in hybrid organic light-emitting diodesSynthetic Metals, 2000
- Improving the performance of doped π-conjugated polymers for use in organic light-emitting diodesNature, 2000
- Built-in field electroabsorption spectroscopy of polymer light-emitting diodes incorporating a doped poly(3,4-ethylene dioxythiophene) hole injection layerApplied Physics Letters, 1999
- Polymeric anodes for improved polymer light-emitting diode performanceApplied Physics Letters, 1997
- Polymer light-emitting diodes with polyethylene dioxythiophene–polystyrene sulfonate as the transparent anodeSynthetic Metals, 1997
- Polyaniline as a transparent electrode for polymer light-emitting diodes: Lower operating voltage and higher efficiencyApplied Physics Letters, 1994