Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 73: Organic Electronics and Photovoltaics II (jointly with CPP, DS, and HL)

O 73.5: Talk

Thursday, March 14, 2013, 16:15–16:30, H34

Efficient solution processed p-type doping for OLEDs — •Christian Töpel, Thorsten Umbach, André Joppich, Jeanette Böckmann, Anne Köhnen, and Klaus Meerholz — University of Cologne, Chemistry Department

Organic light emitting diodes (OLEDs) have drawn much attention in science and industry. Application such as new generation lighting and display devices contribute strongly. However, drawbacks are inefficient charge carrier injection into and low conductivity of the organic materials. A promising solution for this problem is molecular doping which is commonly used in vacuum processed OLEDs, yielding in highly efficient luminescent devices (pin concept). In this case, the molecular doping leads to partial redoxchemical doping. As vacuum deposition is very cost intensive and does not allow high volume processing, researchers focus more and more on solution processing. Here, we present efficient molecular p-type doping using various crosslinkable small-molecule hole transporting materials combined with a range of molecular dopants. Unipolar devices feature an increase in current density by several orders of magnitude compared to the undoped devices at the same voltage. We will also introduce these layers into all-solution-processed multiple-layer OLEDs. These devices are compared with their vacuum-processed counterparts to show the influence of the deposition method and doping ratio on OLED lifetime and device performance.