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Large-Area Screen-Printed Internal Extraction Layers for Organic Light-Emitting Diodes

Preinfalk, Jan B. 1; Eiselt, Thomas 2; Wehlus, Thomas; Rohnacher, Valentina 1; Hanemann, Thomas 2; Gomard, Guillaume 1,3; Lemmer, Uli 1,3
1 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)
2 Karlsruher Institut für Technologie (KIT)
3 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

To unleash the full potential of white organic light-emitting diodes (OLEDs) as large-area light sources, guided optical modes have to be efficiently outcoupled, which calls for internal extraction layers (IELs) that can be easily integrated into a scalable manufacturing process. To realize such IELs, we developed a high refractive index cattering
polymer:TiO2-nanoparticle mixture that can be deposited onto a large area by using the cost-effective screen-printing method.We exploited this approach to produce a 10 μm thick IEL covering the exact area of active pixels distributed over a 15 × 15 cm2 glass substrate. By optimizing the initial mixture composition, we achieved screen-printing-compatible rheological properties as well as tailored light scattering and Transmission over the visible spectrum. The spatial homogeneity of those optical properties was obtained by additional substrate treatments to improve the wetting behavior and to allow reflow after printing. The devices were finalized by depositing a high-efficiency White OLED stack atop the IEL. We demonstrated a luminous efficacy increase up to 56% due to the scattering layer. ... mehr

DOI: 10.1021/acsphotonics.6b01027
Zitationen: 41
Web of Science
Zitationen: 40
Zitationen: 44
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
Lichttechnisches Institut (LTI)
Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 2330-4022
KITopen-ID: 1000067887
HGF-Programm 43.22.03 (POF III, LK 01) Printed Materials and Systems
Erschienen in ACS photonics
Verlag American Chemical Society (ACS)
Band 4
Heft 4
Seiten 928-933
Schlagwörter organic light-emitting diode, internal extraction layer, screen printing, light outcoupling, nanoparticle, scattering layer, OLED
Nachgewiesen in Dimensions
Web of Science
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