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dc.contributor.author
Kovacic, Milan  
dc.contributor.author
Samigullina, Dinara  
dc.contributor.author
Bouchard, Felix  
dc.contributor.author
Krc, Janez  
dc.contributor.author
Lipovšek, Benjamin  
dc.contributor.author
Soldera, Marcos Maximiliano  
dc.contributor.author
Lasagni, Andres Fabian  
dc.contributor.author
Reineke, Sebastian  
dc.contributor.author
Topic, Marko  
dc.date.available
2023-01-05T12:08:41Z  
dc.date.issued
2021-07  
dc.identifier.citation
Kovacic, Milan; Samigullina, Dinara; Bouchard, Felix; Krc, Janez; Lipovšek, Benjamin; et al.; Analysis and optimization of light outcoupling in OLEDs with external hierarchical textures; Optical Society of America; Optics Express; 29; 15; 7-2021; 23701-23716  
dc.identifier.issn
1094-4087  
dc.identifier.uri
http://hdl.handle.net/11336/183469  
dc.description.abstract
Hierarchical textures (combining 2D periodic large and small micro textures) as an external outcoupling solution for OLEDs have been researched, both experimentally and by optical simulations. For the case of a red bottom emitting OLED, different hierarchical textures were fabricated using laser-based methods and a replication step and applied to the OLED substrate, resulting in an increased light outcoupling. Laboratory-size OLED devices with applied textured foils show a smaller increase in efficiency compared to the final large area devices. The results show that the full exploitation of textured foils in laboratory-size samples is mainly limited by the lateral size of the thin film stack area and by limited light collection area of the measuring equipment. Modeling and simulations are used to further evaluate the full prospective of hierarchical textures in large area OLED devices. Optimization of hierarchical textures is done by simultaneously changing the aspect ratios of the small and large textures and a potential of 57% improvement in EQE compared to devices without applied textures is predicted by simulations. Optimized hierarchical textures show similar outcoupling efficiencies compared to optimized single textures, while on the other hand hierarchical textures require less pronounced features, lower aspect ratios, compared to single textures to achieve the same efficiencies. Hierarchical textures also help in eliminating flat parts that limit outcoupling efficiency. Finally, the limiting factors that prevent higher outcoupling are addressed. We show that the dominant factor is non-ideal reflection from the organic thin film stack due to parasitic absorption. In addition, possible ways to further increase the outcoupling from a thick substrate are indicated.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Optical Society of America  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
OLED  
dc.subject
outcoupling  
dc.subject
laser processing  
dc.subject
hot embossing  
dc.subject.classification
Ingeniería Eléctrica y Electrónica  
dc.subject.classification
Ingeniería Eléctrica, Ingeniería Electrónica e Ingeniería de la Información  
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INGENIERÍAS Y TECNOLOGÍAS  
dc.title
Analysis and optimization of light outcoupling in OLEDs with external hierarchical textures  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2022-09-29T11:00:27Z  
dc.journal.volume
29  
dc.journal.number
15  
dc.journal.pagination
23701-23716  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Kovacic, Milan. University of Ljubljana; Eslovenia  
dc.description.fil
Fil: Samigullina, Dinara. University of Ljubljana; Eslovenia  
dc.description.fil
Fil: Bouchard, Felix. Technische Universität Dresden; Alemania  
dc.description.fil
Fil: Krc, Janez. University of Ljubljana; Eslovenia  
dc.description.fil
Fil: Lipovšek, Benjamin. Technische Universität Dresden; Alemania  
dc.description.fil
Fil: Soldera, Marcos Maximiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas. Universidad Nacional del Comahue. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas; Argentina  
dc.description.fil
Fil: Lasagni, Andres Fabian. Technische Universität Dresden; Alemania  
dc.description.fil
Fil: Reineke, Sebastian. University of Ljubljana; Eslovenia  
dc.description.fil
Fil: Topic, Marko. University of Ljubljana; Eslovenia  
dc.journal.title
Optics Express  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1364/OE.428021