Stolz, Sebastian ; Scherer, Michael ; Mankel, Eric ; Lovrinčić, Robert ; Schinke, Janusz ; Kowalsky, Wolfgang ; Jaegermann, Wolfram ; Lemmer, Uli ; Mechau, Norman ; Hernandez-Sosa, Gerardo (2014)
Investigation of Solution-Processed Ultrathin Electron Injection Layers for Organic Light-Emitting Diodes.
In: ACS Applied Materials & Interfaces, 6 (9)
doi: 10.1021/am500287y
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We study two types of water/alcohol-soluble aliphatic amines, polyethylenimine (PEI) and polyethyleni-mine-ethoxylated (PEIE), for their suitability as electron injection layers in solution-processed blue fluorescent organic light-emitting diodes (OLEDs). X-ray photoelectron spectroscopy is used to determine the nominal thickness of the polymer layers while ultraviolet photoelectron spectroscopy is carried out to determine the induced work-function change of the silver cathode. The determined work-function shifts are as high as 1.5 eV for PEI and 1.3 eV for PEIE. Furthermore, atomic force microscopy images reveal that homogeneous PEI and PEIE layers are present at nominal thicknesses of about 11 nm. Finally, we solution prepare blue emitting polymer-based OLEDs using PEI/PEIE in combination with Ag as cathode layers. Luminous efficiency reaches 3 and 2.2 cd A−1, whereas maximum luminance values are as high as 8000 and 3000 cd m−2for PEI and PEIE injection layers, respectively. The prepared devices show a comparable performance to Ca/Ag OLEDs and an improved shelf lifetime.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Stolz, Sebastian ; Scherer, Michael ; Mankel, Eric ; Lovrinčić, Robert ; Schinke, Janusz ; Kowalsky, Wolfgang ; Jaegermann, Wolfram ; Lemmer, Uli ; Mechau, Norman ; Hernandez-Sosa, Gerardo |
| Art des Eintrags: | Bibliographie |
| Titel: | Investigation of Solution-Processed Ultrathin Electron Injection Layers for Organic Light-Emitting Diodes |
| Sprache: | Englisch |
| Publikationsjahr: | 23 April 2014 |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ACS Applied Materials & Interfaces |
| Jahrgang/Volume einer Zeitschrift: | 6 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.1021/am500287y |
| Kurzbeschreibung (Abstract): | We study two types of water/alcohol-soluble aliphatic amines, polyethylenimine (PEI) and polyethyleni-mine-ethoxylated (PEIE), for their suitability as electron injection layers in solution-processed blue fluorescent organic light-emitting diodes (OLEDs). X-ray photoelectron spectroscopy is used to determine the nominal thickness of the polymer layers while ultraviolet photoelectron spectroscopy is carried out to determine the induced work-function change of the silver cathode. The determined work-function shifts are as high as 1.5 eV for PEI and 1.3 eV for PEIE. Furthermore, atomic force microscopy images reveal that homogeneous PEI and PEIE layers are present at nominal thicknesses of about 11 nm. Finally, we solution prepare blue emitting polymer-based OLEDs using PEI/PEIE in combination with Ag as cathode layers. Luminous efficiency reaches 3 and 2.2 cd A−1, whereas maximum luminance values are as high as 8000 and 3000 cd m−2for PEI and PEIE injection layers, respectively. The prepared devices show a comparable performance to Ca/Ag OLEDs and an improved shelf lifetime. |
| Freie Schlagworte: | polyethylenimine, polyethylenimine-ethoxylated, injection layers, photoelectron spectroscopy, OLEDs, printed electronics |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 26 Feb 2015 09:49 |
| Letzte Änderung: | 29 Mär 2015 16:06 |
| PPN: | |
| Sponsoren: | We acknowledge financial support for the projects NanoPEP (FKZ 13N12127) and MORPHEUS (FKZ 13N11705) of the Leading-Edge Cluster Forum Organic Electronics managed by InnovationLab GmbH within the Strategy for Germany of the , Federal Ministry of Education and Research., We furthermore acknowledge the German Federal Ministry of Education and Research for financial support via the project MESOMERIE (FKZ 13N10721). |
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