Universität zu Köln

Merklein, Lisa ORCID: 0000-0002-0333-8926, Mink, Marvin, Kourkoulos, Dimitrios, Ulber, Benjamin, Raupp, Sebastian M., Meerholz, Klaus ORCID: 0000-0001-7450-4672, Scharfer, Philip and Schabel, Wilhelm (2019). Multilayer OLEDs with four slot die-coated layers. J. Coat. Technol. Res., 16 (6). S. 1643 - 1653. NEW YORK: SPRINGER. ISSN 1935-3804

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Abstract

For the first time, multilayer OLEDs with four solution-processed layers are fabricated step-bystep using slot die coating. A suitable choice of coating parameters and fluid formulation enables the application of different material classes as large-area homogeneous layers with thicknesses in the nanometer range. The AFM measurements of the slot die-coated layers consisting of small molecules showed Ra values of 0.21-0.28 nm, less than previously reported in the literature. Based on a two-layer reference OLED consisting of a HIL and EML, the stack architecture is first extended by a crosslinked HTL. These threelayer OLEDs with a crosslinked HTL achieve 70% higher efficiency, compared to that of the reference devices, thus assuming successfully separated layers. In a further step, an additional ETL is applied via the orthogonal solvent approach to obtain four solutionprocessed layers. The averaged power efficiency of the four-layer OLEDs is increased by a factor of 2.2 compared to the reference OLEDs up to a value of 3.5 lm/W. Based on these results, it can be assumed that both approaches, the use of orthogonal solvents as well as the application of crosslinkable materials, have been successfully combined to fabricate multilayer OLEDs with four separated slot die-coated layers.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Merklein, Lisa UNSPECIFIED orcid.org/0000-0002-0333-8926 UNSPECIFIED Mink, Marvin UNSPECIFIED UNSPECIFIED UNSPECIFIED Kourkoulos, Dimitrios UNSPECIFIED UNSPECIFIED UNSPECIFIED Ulber, Benjamin UNSPECIFIED UNSPECIFIED UNSPECIFIED Raupp, Sebastian M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED Scharfer, Philip UNSPECIFIED UNSPECIFIED UNSPECIFIED Schabel, Wilhelm UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-129027
DOI:	10.1007/s11998-019-00225-2
Journal or Publication Title:	J. Coat. Technol. Res.
Volume:	16
Number:	6
Page Range:	S. 1643 - 1653
Date:	2019
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1935-3804
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LIGHT-EMITTING-DIODES; CROSS-LINKING; ANODE BUFFER; SURFACE; PERFORMANCE; FABRICATION; SOLUBILITY; POLYMERS; PLASMA Multiple languages Chemistry, Applied; Materials Science, Coatings & Films Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12902