Photonics Research Group Home
Ghent University Journals/Proceedings
About People Research Publications Education
 IMEC
intern

 

Publication detail

Authors: P. Vandersteegen, G. Schwartz, P. Bienstman, R. Baets
Title: Luminous power efficiency optimization of a white organic light-emitting diode by tuning its spectrum and its extraction efficiency
Format: International Journal
Publication date: 5/2008
Journal/Conference/Book: Applied Optics
Volume(Issue): 47(3) p.1-9
Internal Reference: [N-701]
Download: Download this Publication (1MB) (1MB)

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%.


Back to publication list