Journal
ORGANIC ELECTRONICS
Volume 12, Issue 11, Pages 1858-1863Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2011.07.021
Keywords
Organic light emitting diodes; Organic/metal interface; Surface engineering; Solvent treatment; Electron injection barrier; Interface dipole
Funding
- Ministry of Science and Technology [2009CB623604, 2009CB930604, 2008AA03A311]
- National Nature Science Foundation of China [61076116]
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By simply spin-coating the solvents, such as ethanol and methanol, on top of the organic active layer, the performance of polymer organic light-emitting diodes is significantly enhanced. The quantum efficiency is increased by as large as 58% for low work function Ba/Al cathode devices after solvent treatment. An interface dipole between the organic layer and the metal layer induced by the solvent, either from the intrinsic dipole or the interaction between the solvent and the cathode metal, is responsible for the device performance improvement. The interface dipole layer, which is confirmed by the Kelvin Probe Force Microscopy and the photovoltaic measurements, lifts the vacuum level on the metal side, thereby reducing the electron injection barrier at the organic/metal interface, and leading to better device performance. (C) 2011 Elsevier B.V. All rights reserved.
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