Universität zu Köln

Merklein, Lisa ORCID: 0000-0002-0333-8926, Daume, Dominik, Braig, Felix, Schlisske, Stefan ORCID: 0000-0002-3220-8012, Roedlmeier, Tobias, Mink, Marvin, Kourkoulos, Dimitrios ORCID: 0000-0002-0434-4404, Ulber, Benjamin, Di Biase, Manuela, Meerholz, Klaus ORCID: 0000-0001-7450-4672, Hernandez-Sosa, Gerardo ORCID: 0000-0002-2871-6401, Lemmer, Uli ORCID: 0000-0001-9892-329X, Sauer, Hans Martin, Doersam, Edgar, Scharfer, Philip and Schabel, Wilhelm (2019). Comparative Study of Printed Multilayer OLED Fabrication through Slot Die Coating, Gravure and Inkjet Printing, and Their Combination. Colloid Interfac., 3 (1). BASEL: MDPI. ISSN 2504-5377

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Abstract

In this study, multilayer organic light-emitting diodes (OLEDs) consisting of three solution-processed layers are fabricated using slot die coating, gravure printing, and inkjet printing, techniques that are commonly used in the industry. Different technique combinations are investigated to successively deposit a hole injection layer (poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)), a cross-linkable hole transport layer (N,N '-bis(4-(6-((3-ethyloxetan-3-yl)methoxy)-hexyloxy)phenyl)-N,N '-bis(4-methoxyphenyl)biphenyl-4,4 '-diamin (QUPD)), and a green emissive layer (TSG-M) on top of each other. In order to compare the application techniques, the ink formulations have to be adapted to the respective process requirements. First, the influence of the application technique on the layer homogeneity of the different materials is investigated. Large area thickness measurements of the layers based on imaging color reflectometry (ICR) are used to compare the application techniques regarding the layer homogeneity and reproducible film thickness. The total stack thickness of all solution-processed layers of 32 OLEDs could be reproduced homogeneously in a process window of 30 nm for the technique combination of slot die coating and inkjet printing. The best efficiency of 13.3 cd A(-1) is reached for a process combination of slot die coating and gravure printing. In order to enable a statistically significant evaluation, in total, 96 OLEDs were analyzed and the corresponding 288 layers were measured successively to determine the influence of layer homogeneity on device performance.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Merklein, Lisa UNSPECIFIED orcid.org/0000-0002-0333-8926 UNSPECIFIED Daume, Dominik UNSPECIFIED UNSPECIFIED UNSPECIFIED Braig, Felix UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlisske, Stefan UNSPECIFIED orcid.org/0000-0002-3220-8012 UNSPECIFIED Roedlmeier, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Mink, Marvin UNSPECIFIED UNSPECIFIED UNSPECIFIED Kourkoulos, Dimitrios UNSPECIFIED orcid.org/0000-0002-0434-4404 UNSPECIFIED Ulber, Benjamin UNSPECIFIED UNSPECIFIED UNSPECIFIED Di Biase, Manuela UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED Hernandez-Sosa, Gerardo UNSPECIFIED orcid.org/0000-0002-2871-6401 UNSPECIFIED Lemmer, Uli UNSPECIFIED orcid.org/0000-0001-9892-329X UNSPECIFIED Sauer, Hans Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Doersam, Edgar UNSPECIFIED UNSPECIFIED UNSPECIFIED Scharfer, Philip UNSPECIFIED UNSPECIFIED UNSPECIFIED Schabel, Wilhelm UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-154151
DOI:	10.3390/colloids3010032
Journal or Publication Title:	Colloid Interfac.
Volume:	3
Number:	1
Date:	2019
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2504-5377
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; SMALL-MOLECULE; LAYERS; STABILITY; SURFACE; PLASMA; FILM Multiple languages Chemistry, Physical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15415