Multilayer OLEDs with four slot die-coated layers / Lisa Merklein in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1643-1652 Titre : Multilayer OLEDs with four slot die-coated layers Type de document : texte imprimé Auteurs : Lisa Merklein, Auteur ; Marvin Mink, Auteur ; Dimitrios Kourkoulos, Auteur ; Benjamin Ulber, Auteur ; Sebastian M. Raupp, Auteur ; Klaus Meerholz, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2019 Article en page(s) : p. 1643-1652 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Diodes électroluminescentes Enduction par filière Mesure Morphologie (matériaux) Photoréticulation Poly(3,4-éthylènedioxythiophène) Polystyrène sulfone Revêtement en phase solvant Revêtements multicouches Revêtements organiques Solubilité Index. décimale : 667.9 Revêtements et enduits Résumé : For the first time, multilayer OLEDs with four solution-processed layers are fabricated step-by-step 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 three-layer 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 solution-processed 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. Note de contenu : - EXPERIMENTAL : Device architecture - Solubility measurements - Process parameters - Device fabrication - Layer and device characterization - RESULTS AND DISCUSSION : Film morphology - Large-area layer homogeneity - OLED performance DOI : 10.1007/s11998-019-00225-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00225-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33417 [article]

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Slot die-coated blue SMOLED multilayers / Sebastian M. Raupp in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 5 (09/2017) . - p. 1029-1037 Titre : Slot die-coated blue SMOLED multilayers Type de document : texte imprimé Auteurs : Sebastian M. Raupp, Auteur ; Lisa Merklein, Auteur ; Sebastian Hietzschold, Auteur ; Martin Zürn, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2017 Article en page(s) : p. 1029-1037 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diodes électroluminescentes Electronique -- Matériaux Enduction Microscopie à force atomique Morphologie (matériaux) Poly(3,4-éthylènedioxythiophène) Polystyrène sulfone Revêtement -- Séchage Revêtements multicouches Index. décimale : 667.9 Revêtements et enduits Résumé : The key challenge in solution-processing efficient OLEDs is to realize the multilayer device architecture. We demonstrate that slot die coating is applicable to deposit small-molecule (SM) layers on top of each other without dissolving the underlying layer. A stack for a blue SMOLED is chosen comprising slot die-coated PEDOT:PSS, an SM emissive layer (EML) as well as an SM electron transport layer (ETL). The devices are fabricated in a sheet-to-sheet coating process with a slot die table coater under ambient conditions. While keeping the processing parameters constant for PEDOT:PSS and the EML, the composition of the ETL is varied. The choice of solvent for coating the ETL is crucial regarding wetting and dissolution of the underlying layer, solubility, surface roughness, and device efficiencies. Average roughness values down to 0.38 nm and peak to valley values around 10 nm were measured. Comparing device efficiencies of devices with and without ETL, an increase in efficiency with a factor up to 42 was achieved. In total, we show 135 blue SMOLEDs to demonstrate reproducibility. DOI : 10.1007/s11998-017-9964-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9964-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29138 [article]

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