OPEG member Mattias Lindh successfully defended his licentiate thesis "Bilayer light-emitting electrochemical cells for signage and lighting applications".
The thesis includes two different but inherently connected methods to achieve patterned area light emission from light-emitting electrochemical cells in bilayer configuration. In the thesis, Mattias suggests that these devices can fill a gap in available light-patterning methods, which could accelerate the development of e.g., active packaging.
OPEG member Amir Asadpoordarvish successfully defended his PhD thesis "Functional and Flexible Light-Emitting Electrochemical Cells".
The thesis presents methods to fabricate light-emitting electrochemical cells on flexible substrates, such as plastic and paper, as well as methods for encapsulation to ensure long-lifetime stable operation in ambient air.
OPEG member Christian Larsen successfully defended his PhD thesis "Fabricating designed fullerene nanostructures for functional electronic devices".
This thesis presents methods to fabricate fullerene-based nanostructures and patterns, and presents feasible methods to utilize these in order to realize functional electronic devices such as organic field-effect transistors and solar cells.
In the article "Inkjet Printed Bilayer Light-Emitting Electrochemical Cells for Display and Lighting Applications" we show that functional bilayer light-emitting electrochemical cells can be achieved through inkjet deposition of the electrolyte, and subsequent deposition of the emitting material as a separate layer. We demonstrate the versatility of the concept by making patterned static displays with 170 PPI and components with homogenous emission across a large area.
The work was published in the scientific journal Small (volume 10(20), pages 4148-4153, July 28, 2014), and was marketed as a frontispiece.
The OPEG member Andreas Sandström has successfully defended his PhD thesis "Design and Fabrication of Light-Emitting Electrochemical Cells".
The thesis presents his work that has taken the small, laboratory scale LECs to impressive, large scale devices, including flexible devices fabricated by roll-to-roll techniques in ambient conditions.
In the article "Photochemical Transformation of Fullerenes", we challenge the conventional picture of what happens when PCBM-fullerenes undergo light-induced dimerization. We propose a different reaction model and demonstrate its validity through analytical reasoning and computational modeling.
The work was published as cover feature article, in the scientific journal Advanced Functional Materials (Issue 25, pages 3220-3225, July 5, 2013).
A completely roll-to-roll compatible light emitting device has been fabricated completely in air for the very first time! Using an ink developed in our group, and the roll coating expertise of our colleagues Henrik F. Dam and Frederik C. Krebs at the Technical University of Denmark, we managed to fabricate flexible and transparent light emitting foils using methods akin to how newspapers are made. This work was featured in the prestigious journal Nature Communications.
Ambient fabrication of flexible and large-area organic light-emitting devices using slot-die coating
The technology journal Ny Teknik has also published a story on the same work, as did the regional news channel Västerbottensnytt. Follow the links below to take part of their reports in swedish.
Ny svensk ljuskälla direkt ur tryckpressen - Ny Teknik
Uppfinning imiterar dagsljus - Västerbottensnytt
Region Västerbotten and Länsstyrelsen Västerbotten have awarded the Västerbotten Grand-Pris 2012 to our group member Andreas Sandström.
Lysande innovatör vinner första Grand-priset
Knut and Alice Wallenberg foundation has awarded 40,5 MSEK to a research constellation including representatives from the Organic Photonics and Electronics Group. The goal of the research is to develop a sustainable green energy source, conceptualized as “an artificial leaf”.
Två projekt vid Umeå universitet får 70 Wallenbergmiljoner
Tougher demands on lighting design emphasise the importance of new illumination techiques. This story on Swedish national television uses our reserch on low-energy consuming light-emitting devices to exemplify novel ligthing technologies.
Snart kan du måla upp din belysning
Our work on "Direct UV-Patterning of Electronically Active Fullerene Films" was recently published as cover feature article in the scientific journal Advanced Functional Materials (Issue 19, pages 3723-3728, October 7, 2011).
The article describes how UV light is utilized for the attainment of high-resolution and electronically active patterns in [6,6]-phenyl C61-butyric acid methyl ester (PCBM) films with a novel, photoresist-free method.
Our work on all-plastic light-emitting devices was featured in The Economist and Ny Teknik; see Prof. Nathaniel Robinson and Dr. Piotr Matyba present the technology in this movie.
Graphene and mobile ions - the key to all-plastic devices
Piotr Matyba has successfully defended his PhD thesis
Polymer light-emitting electrochemical cells: Utilizing doping for generation of light.
The Organic Electronics and Photonics Group
Department of Physics
Linnaeus väg 20
SE-901 87 Umeå
Fysikhuset, 2nd floor
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