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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 15 — Jul. 23, 2007
  • pp: 9715–9721

Design of non-periodic dielectric stacks for tailoring the emission of organic lighting-emitting diodes

Mukul Agrawal and Peter Peumans  »View Author Affiliations

Optics Express, Vol. 15, Issue 15, pp. 9715-9721 (2007)

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The majority of photons emitted in organic light-emitting diodes are either trapped in the substrate or emitted into lossy waveguided modes. We show how optimized, non-periodic dielectric stacks inserted between the substrate and transparent anode can be used to improve the photon outcoupling efficiency by tailoring of the local photon density of states. Unlike previously demonstrated outcoupling schemes, this method does not lead to pixel blurring and maintains a Lambertian angular emission profiles within a specified cone. For small molecular weight, green-emitting devices, a 2.5-fold uniformly distributed increase in brightness is achievable for a viewing angle of 60°.

© 2007 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(310.1620) Thin films : Interference coatings

ToC Category:
Optical Devices

Original Manuscript: April 24, 2007
Revised Manuscript: May 22, 2007
Manuscript Accepted: May 22, 2007
Published: July 19, 2007

Mukul Agrawal and Peter Peumans, "Design of non-periodic dielectric stacks for tailoring the emission of organic lighting-emitting diodes," Opt. Express 15, 9715-9721 (2007)

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