Dr. Ekaterina Nannen

NanoEnergieTechnikZentrum, Member of the Board of Directors

Dr. Ekaterina Nannen

NanoEnergieTechnikZentrum, Member of the Board of Directors

Biography

2016-  Member of the Board of Directors of NanoEnergieTechnZentrums (NETZ)
2012-  Leader of the Junior Research Group SSL at Faculty of Engineering (Uni DuE), Center for NanoIntegration (Duisburg-Essen) and OSRAM AG
2006-2012 Ph.D. Studies at University Duisburg-Essen

Awards and Fellowships:
Outstanding Poster Award from JACS (QD2016 Jeju, Korea), Woman DrivING Award‘14 (Volkswagen AG), Green Photonics Award for Solid State Lighting and Displays’14 (SPIE); “Global Young Faculty”-Fellow ’13-’15 (Mercator Foundation); Innovation-Award Engineering Sciences‘12 (Sparkasse am Niederrhein), „Professor Dr. Koepchen-Studien-stiftung“-Fellow ’02–’04 (RWE NET AG)


Hybrid Quantum Dot – Light-Emitting Electrochemical Cells

The solution based processing makes light emitting electrochemical cells (LECs) a promising device alternative for large area flexible lighting solutions. Compared to organic light emitting diodes (OLEDs) and Quantum Dot (QD) LEDs, LECs exhibit a much more simple device architecture comprising ionic components, which facilitate charge carrier injection into the device under an applied electrical field. Despite the potential benefits of LECs as well as recent advances, the market entry of these types of devices is challenging mainly due to the lack of at the same time efficient, bright and long-term stable emitter materials of different colors.

We present an all solution based hybrid device concept implementing colloidal QDs as an additional active light emitting layer in Ir-iTMC based LECs. The hybrid devices show light emission from both QDs and LEC emitter. Electro- and photoluminescence measurements indicate that in the chosen device architecture, charge carriers can be injected directly into both light emitting species, which is beneficial for the implementation of QDs with various band gaps and thus creation of white light emitting hybrid devices. The additional QD layer furthermore improves the electron injection into the active LEC layer which leads to a faster device turn-on and an improved charge carrier balance, resulting in an increased luminance and device efficiency. Hybrid devices containing yellow emitting iTMC and blue QDs emit white light at a maximum CRI of 78 with an external quantum efficiency of 0.03 %.

All session by Dr. Ekaterina Nannen

Session 4

11:00 - 13.00
SEESTUDIO, SEEFOYER, PROPTER HOMINES
LED professional Symposium +Expo
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