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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 2 — Jan. 16, 2012
  • pp: 1816–1824

Polarizer-free, high-contrast inverted top-emitting organic light emitting diodes: effect of the electrode structure

Hyunsu Cho and Seunghyup Yoo  »View Author Affiliations

Optics Express, Vol. 20, Issue 2, pp. 1816-1824 (2012)

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Circular polarizer (CP)-free, high-contrast inverted top-emitting organic light-emitting diodes (ITOLEDs) are demonstrated by using a semitransparent Ag electrode capped with a single dielectric layer as a top anode and Cs2CO3 (1.5 nm)/Al (1.5 nm)/Cr (100nm) as a partially absorbing bottom cathode. Low luminous reflectance is achieved by combining the broadband absorption of Cr, the weak but inherent cavity structure, and the optimal thickness of the capping layer yielding a high transmittance of a top electrode. With the optimized organic capping layer, contrast-enhanced ITOLEDs exhibit a luminous reflectance as low as 3.6% with a large thickness margin. Their luminous efficiency is shown to be comparable to or even higher than that of CP-based conventional OLEDs.

© 2012 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.4170) Optical devices : Multilayers
(310.6860) Thin films : Thin films, optical properties
(310.6845) Thin films : Thin film devices and applications

ToC Category:
Optical Devices

Original Manuscript: October 27, 2011
Revised Manuscript: January 2, 2012
Manuscript Accepted: January 3, 2012
Published: January 12, 2012

Hyunsu Cho and Seunghyup Yoo, "Polarizer-free, high-contrast inverted top-emitting organic light emitting diodes: effect of the electrode structure," Opt. Express 20, 1816-1824 (2012)

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