Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Efficient Top-Emitting Organic Light Emitting Diode with Surface Modified Silver Anode

  • Kim, Sung-Jun (Material Science and Engineering, Pohang University of Science and Technology) ;
  • Hong, Ki-Hyon (Material Science and Engineering, Pohang University of Science and Technology) ;
  • Kim, Ki-Soo (Material Science and Engineering, Pohang University of Science and Technology) ;
  • Lee, Ill-Hwan (Material Science and Engineering, Pohang University of Science and Technology) ;
  • Lee, Jong-Lam (Material Science and Engineering, Pohang University of Science and Technology)
  • Received : 2010.05.19
  • Accepted : 2010.06.22
  • Published : 2010.07.01
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Abstract

The enhancement of quantum efficiency using a surface modified Ag anode in top-emitting organic light emitting diodes (TEOLEDs) is reported. The operation voltage at the current density of $1\;mA/cm^2$ of TEOLEDs decreased from 9.3 V to 4.3 V as the surface of anode coated with $CuO_x$ layer. The work function of these structures were quantitatively determined using synchrotron radiation photoemission spectroscopy. Secondary electron emission spectra revealed that the work function of the Ag/$CuO_x$ structure is higher by 0.6 eV than that of Ag. Thus, the $CuO_x$ structure acts as a role in reducing the hole injection barrier by about 0.6 eV, resulting in a decrease of the turn-on voltage of top-emitting light emitting diodes.

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