Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Micropatterning OLEDs using electron beam technology

27.04.2016

The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP will be presenting the first micro-OLEDs patterned using electron beam at Booth 1023 during SID Display Week 2016 in San Francisco / USA from May 24 – 26.

Fraunhofer FEP has years of experience in the field of processing organic semiconductor materials. Scientists here are also developing organic light-emitting diodes (OLEDs) and OLED microdisplays based on organic semiconductors.


OLED patterned with an electron beam

© Fraunhofer FEP / Photographer Semper Opera: Christof Lippmann


OLED patterned with an electron beam (Patterning: A. Rudzinski, Raith GmbH)

© Fraunhofer FEP / Photographer: Jürgen Lösel

Currently, techniques and new applications of electron beam technology – an additional area of core expertise at Fraunhofer FEP – are being particularly investigated in the field of organic electronics. Due to their outstanding optical and electronic properties, OLEDs have a broad range of potential applications in mobile electronics and displays.

Especially small displays with high pixel density, such as OLED microdisplays, are necessary for future applications such as augmented- or virtual-reality, for example. Researchers are now working on further miniaturizing while maintaining high resolution.

The patterning of the organic layers in OLEDs represents one of the biggest challenges, as conventional methods such as photolithography cannot be applied to organic semiconductor materials easily.

Fraunhofer FEP scientists have developed a novel approach to pattern the emission area of an OLED at high resolution. The patented technology uses an electron beam process, which takes place after finalizing the OLED including the encapsulation. Therefore it is possible to build the OLED highly productive and completely unpatterned, before the emission is individually modified by an adjusted electron beam process.

The energy of the electrons determines their penetration depth in the layer stack. With a suitable choice of process parameters, the encapsulation can also be penetrated by the electron beam and the luminous characteristics of the organic layers beneath will change without destroying or compromising the encapsulation itself. Depending on the application, it is even possible to modify individual layers directly.

“Continuous gray scales in an image can be created on a monochrome OLED using the electron beam, while at the same time the local current consumption is reduced. The longer the dwell time on one spot with the beam, the darker the OLED will appear there”, explains Elisabeth Bodenstein from the development team at Fraunhofer FEP. “An impressive example is the white OLED shown, in which the image of the famous Dresden Semperoper was structured with the electron beam in a hundred seconds.”

Even with a write time of less than two minutes, an impressive resolution of 12,700 dpi was attained – corresponding to 2 µm spacing of the image dots. The structuring of the OLED was carried out with an electron beam lithography system of Raith GmbH, the leading manufacturer of nanofabrication systems.

The process is highly adaptable – regardless of whether the OLED is applied to a rigid medium or flexible film, what color the OLED is, or whether the substrate is optically opaque, translucent, or transparent. The size of the substrate is universal as well and can be matched to the corresponding application. An enhancement to full-color patterning is being planned.

The Fraunhofer FEP scientists are now prepared to put this new technology into practice with industrial partners. The technology was developed within a project funded by the Fraunhofer Gesellschaft.

Fraunhofer FEP at the SID Display Week 2016
Talk
»OLED Microdisplays: Enabling Advanced Near-to-Eye Displays, Sensors, and Beyond«
Dr. Uwe Vogel, Session 52: OLED Displays II (Paper Number 52.2)
May 26, 2016, San Francisco Moscone Convention Center, Room 131

Exhibitor Forum
»Electron Beam Induced High-Resolution Modification of OLED Emission«
Elisabeth Bodenstein

Poster
»Electron Beam Induced High-Resolution Modification of OLED Emission«
Elisabeth Bodenstein, Poster number 208
May 26, 2016, San Francisco Moscone Convention Center, Room City View (Metreon)

Announcement
Fraunhofer FEP is pleased to be host of next SID ME 2017 Chapter Spring Meeting on March 13 – 14, 2017 in Dresden. First Call-for-Papers here:
www.fep.fraunhofer.de/sidme17

Press contact:

Annett Arnold
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP| Phone +49 351 2586 452 | Annett.Arnold@fep.fraunhofer.de
Winterbergstraße 28 | 01277 Dresden | Germany | www.fep.fraunhofer.de

Weitere Informationen:

http://s.fhg.de/88h

Annett Arnold | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP

More articles from Information Technology:

nachricht UT professor develops algorithm to improve online mapping of disaster areas
29.11.2016 | University of Tennessee at Knoxville

nachricht New standard helps optical trackers follow moving objects precisely
23.11.2016 | National Institute of Standards and Technology (NIST)

All articles from Information Technology >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

Im Focus: Fraunhofer ISE Develops Highly Compact, High Frequency DC/DC Converter for Aviation

The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.

Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

UTSA study describes new minimally invasive device to treat cancer and other illnesses

02.12.2016 | Medical Engineering

Plasma-zapping process could yield trans fat-free soybean oil product

02.12.2016 | Agricultural and Forestry Science

What do Netflix, Google and planetary systems have in common?

02.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>