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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 11 — Apr. 10, 2008
  • pp: 1947–1955

Luminous power efficiency optimization of a white organic light-emitting diode by tuning its spectrum and its extraction efficiency

Peter Vandersteegen, Gregor Schwartz, Peter Bienstman, and Roel Baets  »View Author Affiliations


Applied Optics, Vol. 47, Issue 11, pp. 1947-1955 (2008)
http://dx.doi.org/10.1364/AO.47.001947


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Abstract

We show an increase of the luminous power efficiency of a white organic light-emitting diode (LED) with three emitters by optimizing its spectrum and its extraction efficiency. To calculate this efficiency we use a model with four parameters: the spectra, extraction efficiencies, internal quantum efficiencies of three emitters, and the driving voltage. This luminous power efficiency increases by 30% by use of a spectrum close to the spectrum of the MacAdam limit. This limit gives the highest luminous efficacy for a given chromaticity. We also show that a white organic LED with an inefficient deep blue emitter can give the same luminous power efficiency as a white organic LED with a more efficient light blue emitter, because of their different fractions in the radiant flux. Tuning the extraction efficiency with a microcavity to the spectrum also increases the luminous power efficiency by 10%.

© 2008 Optical Society of America

OCIS Codes
(250.3680) Optoelectronics : Light-emitting polymers
(330.1715) Vision, color, and visual optics : Color, rendering and metamerism

ToC Category:
Vision, color, and visual optics

History
Original Manuscript: October 8, 2007
Revised Manuscript: January 11, 2008
Manuscript Accepted: January 11, 2008
Published: April 9, 2008

Virtual Issues
Vol. 3, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Peter Vandersteegen, Gregor Schwartz, Peter Bienstman, and Roel Baets, "Luminous power efficiency optimization of a white organic light-emitting diode by tuning its spectrum and its extraction efficiency," Appl. Opt. 47, 1947-1955 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-11-1947

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