Workfunction-Tunable, N-Doped Reduced Graphene Transparent Electrodes for High-Performance Polymer Light-Emitting Diodes

Cited 231 time in webofscience Cited 0 time in scopus
  • Hit : 522
  • Download : 0
Graphene is a promising candidate to complement brittle and expensive transparent conducting oxides. Nevertheless, previous research efforts have paid little attention to reduced graphene, which can be of great benefit due to low-cost solution processing without substrate transfer. Here we demonstrate workfunction-tunable, highly conductive, N-doped reduced graphene film, which is obtainable from the spin-casting of graphene oxide dispersion and can be successfully employed as a transparent cathode for high-performance polymer light-emitting diodes (PLEDs) as an alternative to fluorine-doped tin oxide (FTO). The sheet resistance of N-doped reduced graphene attained 300 Omega/square at 80% transmittance, one of the lowest values ever reported from the reduction of graphene oxide films. The optimal doping of quaternary nitrogen and the effective removal of oxygen functionalities via sequential hydrazine treatment and thermal reduction accomplished the low resistance. The PLEDs employing N-doped reduced graphene cathodes exhibited a maximum electroluminescence efficiency higher than those of FTO-based devices (4.0 cd/A for FTO and 7.0 cd/A for N-doped graphene at 17 000 cd/m(2)). The reduced barrier for electron injection from a workfunction-tunable, N-doped reduced graphene cathode offered this remarkable device performance.
Publisher
AMER CHEMICAL SOC
Issue Date
2012-01
Language
English
Article Type
Article
Keywords

EXFOLIATED GRAPHITE OXIDE; STABLE METAL-OXIDES; AQUEOUS DISPERSIONS; FIELD-EMISSION; CARBON-FILMS; LAYER; AREA; REDUCTION; DEVICES; DEPOSITION

Citation

ACS NANO, v.6, no.1, pp.159 - 167

ISSN
1936-0851
DOI
10.1021/nn203176u
URI
http://hdl.handle.net/10203/97872
Appears in Collection
NT-Journal Papers(저널논문)EE-Journal Papers(저널논문)MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 231 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0