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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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Highly efficient polymer light-emitting diodes using graphene oxide-modified flexible single-walled carbon nanotube electrodes

Cited 3 times inthomson ciCited 3 times inthomson ci
Title
Highly efficient polymer light-emitting diodes using graphene oxide-modified flexible single-walled carbon nanotube electrodes
Author
Lee, Bo RamKim, Jun SukNam, Yun SeokJeong, Hee JinJeong, Seung YolLee, Geon-WoongHan, Joong TarkSong, Myoung Hoon
Keywords
Bending fatigue; Device efficiency; External quantum efficiency; Flexible polymers; Indium tin oxide electrodes; Luminous efficiency; Optical transparency; PEDOT:PSS; Polymer light-emitting diodes; Power efficiency; Single-walled carbon; Surface porosity
Issue Date
201210
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY, v.22, no.40, pp.21481 - 21486
Abstract
We present flexible polymer light-emitting diodes (FPLEDs) using graphene oxide-modified single-walled carbon nanotube (GO-SWCNT) films as an anode on polyethylene terephthalate (PET) substrates. The electrode of GO-SWCNTs used in this study shows quite a low sheet resistance of similar to 75 Omega per square at 65% (at 550 nm) optical transparency with resistance to bending fatigue. The small-sized GO nanosheets onto the SWCNT network films are significantly effective in reducing the sheet resistance and the surface porosity of the SWCNT network films without sacrificing the transmittance. Moreover, the top layer of the large-sized GO nanosheets are crucial for high device efficiency to reduce the roughness of the SWCNT surface and enhance the wettability with PEDOT:PSS. The optimized FPLED using a GO-SWCNT electrode shows a maximum luminous efficiency of 5.0 cd A(-1) (at 9.2 V), power efficiency of 2.4 lm W-1 (at 5.6 V), external quantum efficiency 1.9% (at 9.0 V) and turn-on voltage (2.0 V), which is comparable to conventional PLEDs using an indium-tin-oxide (ITO) electrode (a maximum luminous efficiency of 6.2 cd A(-1) (at 9.4 V), power efficiency of 2.6 lm W-1 (at 5.8 V), external quantum efficiency 2.3% (at 9.0 V) and turn-on voltage (2.0 V)). This result confirms that a GO-SWCNT electrode can be efficiently used to replace ITO for flexible optoelectronic devices.
URI
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DOI
http://dx.doi.org/10.1039/c2jm34700h
ISSN
0959-9428
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