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Formation of blade and slot die coated small molecule multilayers for OLED applications studied theoretically and by XPS depth profiling

Peters, Katharina; Raupp, Sebastian; Hummel, Helga; Bruns, Michael; Scharfer, Philip; Schabel, Wilhelm

Abstract (englisch):
Slot die coaters especially designed for low material consumption and doctor blades were used to process small molecule solutions for organic light-emitting diodes (OLEDs). Optimum process parameters were developed for the large-scale coating techniques to generate stable single and multiple layers only a few nanometers thick. Achieving a multilayer architecture for solution-processed OLEDs is the most challenging step. X-ray photoelectron spectroscopy sputter depth profiling was performed to determine defined interfaces between coated organic layers. Commercially available small molecules NPB (N,N’-Di(1-naphthyl)-N,N’-diphenyl-(1,1’-biphenyl)-4,4’-diamine) and BAlq (Bis(8-hdroxy-2methylquinoline)-(4-phenylphenoxy)aluminum), originally developed for vacuum deposition, were used as hole, respectively electron transport material. Defined double-layers were processed with both scalable coating methods using the orthogonal solvent approach. The use of non-orthogonal solvents resulted in complete intermixing of the material. The results are explained by calculations of solubilities and simulating drying and diffusion kinetics of the small molecule solutions.

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Volltext §
DOI: 10.5445/IR/1000055494
DOI: 10.1063/1.4953845
Zitationen: 8
Web of Science
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Thermische Verfahrenstechnik (TVT)
Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 2158-3226
KITopen-ID: 1000055494
HGF-Programm 43.22.03 (POF III, LK 01)
Printed Materials and Systems
Erschienen in AIP Advances
Band 6
Seiten 065108
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Web of Science
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