
Proceedings Paper
Light extraction and optical loss mechanisms in organic light-emitting diodesFormat | Member Price | Non-Member Price |
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Paper Abstract
The internal quantum efficiency of organic light-emitting diodes (OLEDs) can reach values close to 100% if phosphorescent
emitters to harvest triplet excitons are used, however the fraction of light that is actually leaving the
device is considerably less. Loss mechanisms are for example waveguiding in the organic layers and the substrate
as well as the excitation of surface plasmon polaritons at metallic electrodes. In this work we use numerical
simulations to identify and quantify different loss mechanisms. Changing various simulation parameters, for
example layer thicknesses, enables us to study their influence on the fraction of light leaving the OLED. With
these simulations we therefore can enhance the light output of the OLED stack.
We present simulations of bottom-emitting OLEDs based on the green emitter tris-(8-hydroxyquinoline) aluminum
(Alq3) with transparent indium tin oxide anode and a metallic cathode, as well as microcavity devices
with two metallic electrodes. The results of the simulations are compared with experimental data on the angular
dependent emission spectra and published effi;ciency data.
Paper Details
Date Published: 16 April 2008
PDF: 11 pages
Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 69992V (16 April 2008); doi: 10.1117/12.780525
Published in SPIE Proceedings Vol. 6999:
Organic Optoelectronics and Photonics III
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)
PDF: 11 pages
Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 69992V (16 April 2008); doi: 10.1117/12.780525
Show Author Affiliations
Published in SPIE Proceedings Vol. 6999:
Organic Optoelectronics and Photonics III
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)
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