Journal
OPTICS EXPRESS
Volume 21, Issue 14, Pages 16319-16330Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.016319
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Funding
- von Ardenne Anlagentechnik
- BMBF [13N11060]
- FhG Internal Programs [Attract 692 174]
- Fraunhofer Society
- European Union
- Free State of Saxony (Dresdner Innovationszentrum Energieeffizienz - DIZE-eff)
- European Social Fund
- free state of Saxony through the OrganoMechanics project
- AIF/BMWi in the framework IGF [GF-11/05 resp. AiF-Nr. 16784 BR]
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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
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