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 | DOI: | 10.1364/ao.47.001947 | Citations: | 4 (Dimensions.ai - last update: 13/10/2024) 2 (OpenCitations - last update: 3/5/2024) Look up on Google Scholar
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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%. |
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