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Proceedings Paper

Tuning of the emission color of organic light emitting diodes via smartly designed aluminum plasmonics
Author(s): Manuel Auer-Berger; Veronika Tretnak; Franz-Peter Wenzl; Joachim Krenn; Emil J. W. List-Kratochvil
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Paper Abstract

With the invention of phosphorescent emitter material, organic light emitting diodes with internal quantum yields of up to 100% can be realized. Still, the extraction of the light from the OLED stack is a bottleneck, which hampers the availability of OLEDs with large external quantum efficiencies. In this contribution, we highlight the advantages of integrating aluminum nanodisc arrays into the OLED stack. By this, not only the out-coupling of light can be enhanced, but also the emission color can be tailored and controlled. By means of extinction- and fluorescence spectroscopy measurements we are able to show how the sharp features observed in the extinction measurements correlate with a very selective fluorescence enhancement of the organic emitter materials used in these studies. At the same time, localized surface plasmon resonances of the individual nanodiscs further modify the emission spectrum, e.g., by filtering the green emission tail. A combination of these factors leads to a modification of the emission color in between CIE1931 (x,y) chromaticity coordinates of (0.149, 0.225) and (0.152, 0.352). After accounting for the sensitivity of the human eye, we are able to demonstrate that this adjustment of the chromaticity coordinates goes is accompanied by an increase in device efficiency.

Paper Details

Date Published: 16 February 2017
PDF: 7 pages
Proc. SPIE 10101, Organic Photonic Materials and Devices XIX, 101010C (16 February 2017); doi: 10.1117/12.2252327
Show Author Affiliations
Manuel Auer-Berger, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Veronika Tretnak, Karl-Franzens-Univ. Graz (Austria)
Franz-Peter Wenzl, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Joachim Krenn, Karl-Franzens-Univ. Graz (Austria)
Emil J. W. List-Kratochvil, Humboldt-Univ. zu Berlin (Germany)


Published in SPIE Proceedings Vol. 10101:
Organic Photonic Materials and Devices XIX
Christopher E. Tabor; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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