Thermo-cleavable poly(fluorene-benzothiadiazole) to enable solution deposition of multi-layer organic light emitting diodes

The design of solution processable multi-layer organic light emitting diodes (OLEDs) is often hampered by the choice of solvents. To avoid the dissolution of the emission layer upon the subsequent deposition of further functional layers, we synthesize and investigate thermo-cleavage in poly[2,7-(3-(...

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Hauptverfasser: Höfle, Stefan (VerfasserIn) , Kuhn, Marius (VerfasserIn) , Hamburger, Manuel (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2017
In: Organic electronics
Year: 2016, Jahrgang: 42, Pages: 355-360
DOI:10.1016/j.orgel.2016.12.060
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1016/j.orgel.2016.12.060
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S1566119916305997
Volltext
Verfasserangaben:Stefan Höfle, Min Zhang, Julian Dlugosch, Marius Kuhn, Manuel Hamburger, Alexander Colsmann

MARC

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520 |a The design of solution processable multi-layer organic light emitting diodes (OLEDs) is often hampered by the choice of solvents. To avoid the dissolution of the emission layer upon the subsequent deposition of further functional layers, we synthesize and investigate thermo-cleavage in poly[2,7-(3-(9-methyl-9H-fluorene-9-yl)propyl (2-methylhexane-2-yl) carbonate)-alt-4,7-(benzo[c][1,2,5]thiadiazole)] (c-F8BT). Employed in OLEDs, the non-cleaved polymer yields about the same current efficiency as state-of-the-art F8BT. During pyrolysis at 200 °C, the polymer releases its solubility groups, fully maintaining the device efficiency but becoming insoluble. This feature allows to enhance the OLED performance by applying an additional bathophenanthroline hole blocking layer from solution or by incorporating a low-molecular weight electron transport moiety into the affixing polymer matrix. 
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