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On the interplay of waveguide modes and leaky modes in corrugated OLEDs

Hauss, J.; Bocksrocker, T.; Riedel, B.; Lemmer, U.; Gerken, M.

Abstract:
Bragg gratings incorporated into organic light-emitting diodes (OLEDs) establish a coupling between waveguide modes and useful light (leaky modes). Here we demonstrate that the net coupling direction depends on the OLED stack design. We fabricated two different device structures with gold Bragg gratings. Angle resolved electroluminescence spectra were recorded. For the first device peaks of enhanced emission due to the Bragg grating are observed corresponding to a net energy transfer in direction of the leaky modes. The second device, on the other hand, exhibits dips in the emission spectrum. This reversed direction of energy transfer from the leaky modes to the waveguide modes is explained considering transfer matrix simulations of modal intensity distributions and device emission simulations. An OLED efficiency enhancement is only achieved, if the waveguide mode extraction is dominant.

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Verlagsausgabe §
DOI: 10.5445/IR/1000030075
Veröffentlicht am 14.11.2018
Originalveröffentlichung
DOI: 10.1364/OE.19.00A851
Scopus
Zitationen: 20
Web of Science
Zitationen: 18
Coverbild
Zugehörige Institution(en) am KIT Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2011
Sprache Englisch
Identifikator ISSN: 1094-4087
urn:nbn:de:swb:90-300759
KITopen-ID: 1000030075
Erschienen in Optics Express
Band 19
Heft S4
Seiten A851-A858
Nachgewiesen in Web of Science
Scopus
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