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Applied Physics Letters / Volume 100 / Issue 1 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 100, 013308 (2012); http://dx.doi.org/10.1063/1.3675970 (4 pages)

Surface plasmon-enhanced electroluminescence in organic light-emitting diodes incorporating Au nanoparticles

Y. Xiao1, J. P. Yang1, P. P. Cheng1, J. J. Zhu1, Z. Q. Xu1, Y. H. Deng1, S. T. Lee2, Y. Q. Li1, and J. X. Tang1

1Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China
2Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, China

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(Received 14 November 2011; accepted 19 December 2011; published online 6 January 2012)

Surface plasmon-enhanced electroluminescence (EL) in an organic light-emitting diode is demonstrated by incorporating the synthesized Au nanoparticles (NPs) in the hole injection layer of poly(3,4-ethylene dioxythiophene):polystyrene sulfonic acid. An increase of ∼25% in the EL intensity and efficiency are achieved for devices with Au NPs, whereas the spectral and electrical properties remain almost identical to the control device. Time-resolved photoluminescence spectroscopy reveals that the EL enhancement is ascribed to the increase in spontaneous emission rate due to the plasmonic near-field effect induced by Au NPs.

© 2012 American Institute of Physics

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KEYWORDS and PACS

Keywords

nanoparticles, organic light emitting diodes, photoluminescence, surface plasmon resonance

PACS

  • 85.60.Jb

    Light-emitting devices

  • 78.55.-m

    Photoluminescence, properties and materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3675970

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
(Color online) (a) Schematic device structure of an OLED incorporating Au NPs in the PEDOT: PSS layer. (b) TEM and (c) high-resolution TEM images of the synthesized Au NPs.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
(Color online) (a) Current density-voltage (J-V) and (b) efficiency-current density characteristics of OLEDs with and without Au NPs in the PEDOT:PSS layer. Inset of (a) is the corresponding EL spectra at the current density of 40 mA/cm2.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
(Color online) Time-resolved PL spectra detected at the wavelength of 530 nm via a 370 nm laser source. The inset shows the absorption spectra of the PEDOT: PSS mixed with (dashed line) and without (solid line) Au NPs on ITO-glass substrate and the PL spectrum of an Alq3 layer (solid line with circles).

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
(Color online) Comparison of current efficiency of (a) green emission and (b) red emission OLEDs with and without Au NPs in the PEDOT:PSS layer. Insets are the corresponding EL spectra at a current density of 20 mA/cm2.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

Supplemental Files (EPAPS)



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