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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 5 — Mar. 7, 2005
  • pp: 1406–1411

Contrast-enhancement in organic light-emitting diodes

Zhaoxin Wu, Liduo Wang, and Yong Qiu  »View Author Affiliations

Optics Express, Vol. 13, Issue 5, pp. 1406-1411 (2005)

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A high-contrast organic light-emitting diode (OLED) structure is presented. Because of poor contrast of conventional OLED resulting from high reflective metal cathode, the hybrid cathode structure was developed for low reflectivity. It consists the semitransparent cathode layers, passivation layers and a thick light-absorbing film. By optical reflectivity measurement and OLED electrical characterization tests for both OLED with the hybrid cathode and conventional OLED, it was found that the spectrum reflectance of OLED with hybrid cathode is among 8%–12%, about eight times lower than the conventional one when the two types of devices have similar turn-on voltages and current-voltage characteristics. The hybrid cathode for the high-contrast OLED is easily fabricated and its optical reflectance is slightly dependent on wavelength.

© 2005 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(310.1860) Thin films : Deposition and fabrication

ToC Category:
Research Papers

Original Manuscript: December 1, 2004
Revised Manuscript: February 17, 2005
Published: March 7, 2005

Zhaoxin Wu, Liduo Wang, and Yong Qiu, "Contrast-enhancement in organic light-emitting diodes," Opt. Express 13, 1406-1411 (2005)

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