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Corrugated structure through a spin-coating process for enhanced light extraction from organic light-emitting diodes

Title
Corrugated structure through a spin-coating process for enhanced light extraction from organic light-emitting diodes
Author(s)
Hyun, WJ[Hyun, Woo Jin]Im, SH[Im, Sang Hyuk]Park, OO[Park, O. Ok]Chin, BD[Chin, Byung Doo]
DGIST Authors
Park, OO[Park, O. Ok]
Issued Date
2012-04
Type
Article
Article Type
Article
Subject
CoatingsCorrugated StructureCorrugated StructuresElectroluminescence SpectraExternal Quantum EfficiencyFabrication MethodGlass SubstratesIncidence AnglesInterfaces (Materials)LightLight ExtractionMixing RatiosMixture SolutionOrganic Light-Emitting Diodes (OLEDs)Out-Coupling StructureSilicon CompoundsSolsSolvent EvaporationSpin-Coating ProcessStriationStructural EvolutionStructural ParameterSubstratesSurface TensionTiO
ISSN
1566-1199
Abstract
We have demonstrated a simple fabrication method for an out-coupling structure to enhance light extraction from organic light-emitting diodes (OLEDs). Spin-coating of SiO 2 and TiO x sol mixture solution develops corrugated film. The structural evolution of the corrugation was explained by the localization of surface tension during the solvent evaporation. The structural parameters of the corrugated structure were characterized by varying the spin-coating speed and the mixing ratio of the solution. Compared to conventional devices, OLEDs with a corrugated structure at the backside of the glass substrate showed increased external quantum efficiency without change in the electroluminescence spectrum. The light extraction enhancement is attributed to the decreased incidence angle at the interface of glass substrate and air. © 2012 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/3380
DOI
10.1016/j.orgel.2012.01.001
Publisher
Elsevier B.V.
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