Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 113: Organic Electronics and Photovoltaics: Devices (jointly with CPP, HL)
TT 113.3: Talk
Friday, March 20, 2015, 10:30–10:45, C 130
1,8-Diiodooctane as crosslinking agent for polymeric electron injection layers in OLEDs — •Sebastian Stolz1,5, Martin Petzoldt2,5, Naresh Kotadiya1,5, Eric Mankel3,5, Manuel Hamburger2,5, Uli Lemmer1,4, Norman Mechau1,5, and Gerardo Hernandez-Sosa1,5 — 1Karlsruhe Institute of Technology, Light Technology Institute — 2University of Heidelberg, Institute of Organic Chemistry — 3Technische Universität Darmstadt, Materials Science Institute, Surface Science Division — 4Karlsruhe Institute of Technology, Institute of Microstructure Technology — 5InnovationLab GmbH, Heidelberg
In this work, we investigate an amino-functionalized polyfluorene as electron injection layer in OLEDs. We demonstrate that the polyfluorene film can be crosslinked by adding 1,8-diiodooctane (DIO) to the polyfluorene solution. The crosslinking reaction is confirmed by X-ray photoelectron spectroscopy and rinsing experiments. We furthermore solution process OLEDs that use a PPV derivative commonly known as Super-Yellow as emitting layer and the polyfluorene in combination with silver as cathode layer. In addition to crosslinking, we are able to show that DIO considerably increases the performance of these OLEDs. OLEDs, that use a mixture of DIO and polyfluorene, exhibit an about 0.8 eV lower turn-on voltage while the maximum luminance is almost doubled compared to OLEDs without additive. Furthermore, operational lifetimes are improved by a factor of two.