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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 14 — Jul. 15, 2013
  • pp: 16319–16330

Quantitative allocation of Bragg scattering effects in highly efficient OLEDs fabricated on periodically corrugated substrates

C. Fuchs, T. Schwab, T. Roch, S. Eckardt, A. Lasagni, S. Hofmann, B. Lüssem, L. Müller-Meskamp, K. Leo, M. C. Gather, and R. Scholz  »View Author Affiliations


Optics Express, Vol. 21, Issue 14, pp. 16319-16330 (2013)
http://dx.doi.org/10.1364/OE.21.016319


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Abstract

Bragg scattering effects in bottom-emitting organic light-emitting diodes (OLEDs) grown on corrugated aluminum-doped zinc oxide electrodes are analyzed. Periodic corrugation is introduced by structuring the oxide electrode via UV laser ablation, a process that enables flexible adjustment of the period and height of corrugation. We demonstrate that fabrication of stable and electrically efficient OLEDs on these rough substrates is feasible. Sharp spectral features are superimposed onto the broad emission spectra of the OLEDs, providing clear evidence for Bragg scattering of light from guided modes into the air cone. Theoretical analysis based on an emissive dipole model and conservation of momentum considerations allows a quantitative description of scattering and the associated dispersion relations.

© 2013 OSA

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(160.4890) Materials : Organic materials
(230.3670) Optical devices : Light-emitting diodes
(230.4000) Optical devices : Microstructure fabrication

ToC Category:
Optical Devices

History
Original Manuscript: January 22, 2013
Revised Manuscript: April 18, 2013
Manuscript Accepted: April 22, 2013
Published: July 2, 2013

Citation
C. Fuchs, T. Schwab, T. Roch, S. Eckardt, A. Lasagni, S. Hofmann, B. Lüssem, L. Müller-Meskamp, K. Leo, M. C. Gather, and R. Scholz, "Quantitative allocation of Bragg scattering effects in highly efficient OLEDs fabricated on periodically corrugated substrates," Opt. Express 21, 16319-16330 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-14-16319


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