High efficiency low operating voltage polymer light-emitting diodes with aluminum cathode
- 3 May 2004
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 84 (18) , 3522-3524
- https://doi.org/10.1063/1.1739510
Abstract
By blending poly(ethylene glycol) (PEG) into an electroluminescence (EL) polymer, significantly enhanced EL efficiency in a polymer light-emitting diode (PLED) with aluminum electrode was achieved. An orange-color-emitting PLED with 10 wt % PEG blending achieved device efficiencies exceeding 2.6 cd/A for a wide range of bias voltage, which is more than two orders of magnitude higher than that of a similar PLED without the PEG blending. The enhanced efficiency was a result of the reduction of electron injection barrier height at the cathode–polymer interface. It is believed that interfacial interaction that is specific to Al plays an important role in the enhancement mechanism.Keywords
This publication has 13 references indexed in Scilit:
- Ultrahigh efficiency green polymer light-emitting diodes by nanoscale interface modificationApplied Physics Letters, 2003
- Polymer light-emitting devices using ionomers as an electron injecting and hole blocking layerJournal of Applied Physics, 2001
- Efficient polymer light emitting diodes with metal fluoride/Al cathodesApplied Physics Letters, 2001
- LiF/Al cathodes and the effect of LiF thickness on the device characteristics and built-in potential of polymer light-emitting diodesApplied Physics Letters, 2000
- Evidence of band bending observed by electroabsorption studies in polymer light emitting device with ionomer/Al or LiF/Al cathodeApplied Physics Letters, 2000
- Efficient, Low Operating Voltage Polymer Light-Emitting Diodes with Aluminum as the Cathode MaterialAdvanced Materials, 1998
- Polymer light-emitting electrochemical cells with frozen p-i-n junctionApplied Physics Letters, 1997
- Enhanced electron injection in organic electroluminescence devices using an Al/LiF electrodeApplied Physics Letters, 1997
- Visible light emission from semiconducting polymer diodesApplied Physics Letters, 1991
- Light-emitting diodes based on conjugated polymersNature, 1990