Nov 19 2017 02:00 PM
Nov 19 2017 03:00 PM
KSC Seminar: Printed Organic Optoelectronic Devices: Processability, Performance and Sustainability
Speaker: Dr. Gerardo Hernandez-Sosa
Light Technology Institute, Karlsruhe Institute of
Technology, Germany; InnovationLab GmbH, Heidelberg, Germany
Date & Time: Sunday November 19th at 2pm
Venue: Bldg. 5, 5220
Light refreshments will be provided
Abstract: Printing technology possess the potential of
accelerating and enabling the fabrication of optoelectronic applications in an
unprecedented manner. However, the different device requirements in terms of
device architecture and resolution will set the boundaries for the choice of
printing fabrication technique. Particularly, organic light-emitting diodes
(OLEDs) and organic photodetectors (OPDs) require a multilayer device
architecture for an efficient performance. Therefore, a lot of care has to be
placed in the ink formulation and processing of the materials to maximize
In this talk, we will first discuss different
approaches for the fabrication of OLED active layers by gravure printing.
Moreover, we will present the fabrication of OLEDs utilizing solution processed
electron injection layers (EIL) and the influence of the EIL molecular
structure, thickness and film morphology on the device characteristics.
Furthermore, we demonstrate a simple crosslinking step that improves device
performance and enables processability of printed cathodes.
In the second part, we demonstrate a new
direct-printed patterning technique comprising aerosol jet and inkjet printing,
which allows for very precise, reproducible and deposition of multilayer
devices with high registration accuracy and feature sizes down to a few
micrometers. We apply this method for the fabrication of high performance bulk
–heterojunction-based OPD arrays.
our recent efforts on the inclusion of biodegradable materials as passive and
functional components of printed light-emitting devices will be presented.
- G. Hernandez-Sosa et al, Advanced Functional Materials, 23, 3164, (2013)
- G. Hernandez-Sosa et al, Advanced Materials, 26,3235, (2014)
- R. Eckstein, G. Hernandez-Sosa., Advanced Electronic Materials, 1,1500101 (2015)
- S.Stolz, G. Hernandez-Sosa, J. Mater. Chem. C, 4, 11150 (2016)
- N. Jürgensen,G. Hernandez-Sosa, Scientific Reports, 6, 36643 (2016)
- R. Eckstein, G. Hernandez‐Sosa, Advanced Materials, 28, 7708 (2016)
Biography: Gerardo Hernandez-Sosa received his PhD from the
Johannes Kepler University Linz, Austria in 2009. Currently he is a research
group leader of the Karlsruhe Institute of Technology, based in InnovationLab
Heidelberg, Germany. His research group focuses in the development of printed
optoelectronic devices and the use of biocompatible and sustainable materials
in electronics. Prior to his current post, he worked in the Center for Polymers
and Organic Solids of the University of California Santa Barbara, USA.