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Enhanced Light Extraction from OLEDs Fabricated on Patterned Plastic Substrates

TitleEnhanced Light Extraction from OLEDs Fabricated on Patterned Plastic Substrates
Publication TypeJournal Article
Year of Publication2018
AuthorsHippola, C, Kaudal, R, Manna, E, Xiao, T, Peer, A, Biswas, R, Slafer, WD, Trovato, T, Shinar, J, Shinar, R
JournalAdvanced Optical Materials
Date Published02
Type of ArticleArticle
ISBN Number2195-1071
Accession NumberWOS:000425450300016
Keywordsconductive polymer anodes, devices, efficient, emission, emitting-diodes, highly, indium-tin-oxide, Materials Science, optics, organic light-emitting diodes, organic solar-cells, outcoupling, phosphorescent OLEDs, plastic patterned substrates, quantum efficiency, scattering layer, solid state lighting, transparent electrodes

= 50%); it increases 2.6x relative to a glass/ITO device and 2x relative to devices on glass/poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) or flat PC/PEDOT: PSS. A significant enhancement is also observed for blue PhOLEDs with EQE 1.7x relative to flat PC. The corrugated PC substrates are fabricated efficiently and cost-effectively by direct room-temperature molding. These substrates successfully reduce photon losses due to trapping/waveguiding in the organic+anode layers and possibly substrate, and losses to plasmons at the metal cathode. Focused ion beam gauged the conformality of the OLEDs. Dome-shaped convex nanopatterns with height of similar to 280-400 nm and pitch similar to 750-800 nm were found to be optimal. Substrate design and layer thickness simulations, reported first for patterned devices, agree with the experimental results that present a promising method to mitigate photon loss paths in OLEDs.

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