期刊
APPLIED PHYSICS LETTERS
卷 101, 期 15, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4758682
关键词
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资金
- EC Marie Curie RTN-THREADMILL [MRTN-CT-2006-036040]
- ITN-SUPERIOR [PTN-CT-2009-238177]
- IEF-OPTSUFET [PIEF-GA-2009-235967]
- EC FP7 ONE-P large-scale Project [212311]
- NanoSci-E+ project SENSORS
- International Center for Frontier Research in Chemistry (icFRC)
- Swiss Nationals Science Foundation (SNF)
- Swiss Nanoscience Institute (SNI)
We investigate the functionalization of gold anodes with azobenzene-based self-assembled monolayers (AZO-SAM) and the influence of such functionalization on the external quantum efficiency (EQE) of polyfluorene-based light-emitting diodes (LEDs). Photoluminescence and electroluminescence measurements show that the AZO-SAMs do not modify the shape of the emission spectrum of the active layer. Instead, AZO-SAMs enhance the EQE of LEDs by an order of magnitude (from 0.018% to 0.18%) and decrease the turn-on voltage from 7.9 V to 6.2 V by reducing the injection barrier at the anode, thus promoting a better balance between hole and electron populations in the active layer. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4758682]
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