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. Luessem, L. Mueller-Meskamp, K. Leo, M. C. Gather, R. Scholz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

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. (C) 2013 Optical Society of America

Original languageEnglish
Pages (from-to)16319-16330
Number of pages12
JournalOptics Express
Volume21
Issue number14
DOIs
Publication statusPublished - 15 Jul 2013

Keywords

  • LIGHT-EMITTING-DIODES
  • PHOTONIC CRYSTALS
  • SURFACE-PLASMONS
  • GUIDED MODES
  • THIN-FILMS
  • EMISSION
  • EXTRACTION
  • MICROCAVITIES
  • GRATINGS
  • DEVICES

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