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

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

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 ef...

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Veröffentlicht in:Applied Optics 2008-04, Vol.47 (11), p.1947-1955
Hauptverfasser: Vandersteegen, Peter, Schwartz, Gregor, Bienstman, Peter, Baets, Roel
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container_end_page 1955
container_issue 11
container_start_page 1947
container_title Applied Optics
container_volume 47
creator Vandersteegen, Peter
Schwartz, Gregor
Bienstman, Peter
Baets, Roel
description 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%.
doi_str_mv 10.1364/AO.47.001947
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title Luminous power efficiency optimization of a white organic light-emitting diode by tuning its spectrum and its extraction efficiency
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