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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 22 — Oct. 30, 2006
  • pp: 10819–10824

White organic light-emitting devices with Sm:Ag black cathode

W. F. Xie, L. T. Zhang, and S. Y. Liu  »View Author Affiliations

Optics Express, Vol. 14, Issue 22, pp. 10819-10824 (2006)

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White organic light-emitting device (WOLED) with Sm:Ag black cathode was first reported. The effect of the black cathode on the performances (such as efficiency, luminance, contrast ratio at different angle and EL spectra, etc) of the WOLEDs was discussed. We found that the efficiency of the WOLED with Sm:Ag was comparable to that of the device with conventional Mg:Ag cathode. For example, the efficiency of the device with Sm:Ag cathode is just 15% lower than that of the device with MgAg cathode. However, the contrast ratio (CR) of the device with black cathode is 105:1 under 140 lx ambient lighting at a high brightness of 1000 cd/m2, which is four times better than that of the device with Mg:Ag cathode. Besides, the CR of the WOLED with Sm:Ag cathode is insensitive to the viewing angle less than 50°.

© 2006 Optical Society of America

OCIS Codes
(160.4890) Materials : Organic materials
(230.3670) Optical devices : Light-emitting diodes
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Optical Devices

Original Manuscript: August 30, 2006
Revised Manuscript: October 7, 2006
Manuscript Accepted: October 9, 2006
Published: October 30, 2006

W. F. Xie, L. T. Zhang, and S. Y. Liu, "White organic light-emitting devices with Sm:Ag black cathode," Opt. Express 14, 10819-10824 (2006)

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