2017 Flexible OLEDs Agenda
Wednesday, September 20
Registration Open with Welcome Coffee & Tea
Thank you to this year's conference chair, Dr. Jennifer Colegrove
This session will feature insight on the flexible foldable OLED market, where it is now, what progress has been made and what challenges lay ahead
Challenges and Progress of Flexible and Foldable OLEDs
Dr. Ho-Kyoon Chung | Chair Professor of Sungkyunkwan University (SKKU)
One of the key advantages of OED is the capability to realize displays on flexible substrates, and in particular, foldable OLED has been regarded as the apex of the flexible OLED application. However, there are a number of technical challenges to realize it for mobile application because of the stringent requirements of the performance and reliability. This talk will discuss the issues and review the recent progress that has been made in the industry as well as in the academia for the foldable OLED.
Creating An Open Access Flexible OLED Pilot Line To Bridge The Gap Between R&D And Mass Production
Robert Abbel | Sr. Scientist at the Holst Center of Pi-Scale
Flexible OLEDs potentially offer highly attractive features to product designers in the areas of lighting and signage such as availability in customized shapes and finely patterned and segmented designs over large areas, bendability and an extremely thin form factor, all of which are difficult to accomplish using competing technologies such as LEDs. Nevertheless, flexible OLEDs are not widely employed in design and product development for lighting and signage applications yet, mainly because their commercial availability is still rather limited. The PI-SCALE project is creating an open access pilot line for the production of customized flexible OLEDs and the seamless integration of these into product forms, helping interested customers to realize their ideas by lowering the threshold for experimentation with envisioned innovative product concepts. The aim is to accelerate flexible OLED integration into pilot line users’ products by bridging the gap between R&D and large volume production.
The pilot line is using several flexible OLED fabrication process flows, and the status of two roll-to-roll flows will be highlighted in this contribution. A roll-to-roll produced flexible substrate with the required moisture barrier properties is available from the pilot line service, and roll-to-roll deposition of OLED materials on top of this either by evaporation or by solution processing of the functional layers will be presented. For the roll-to-roll evaporated OLED process flow, 15 m long, 30 cm wide patterned rolls are being regularly produced by the pilot line. For solution processing, patterned deposition of four sequentially slot-die coated layers has been achieved by stripe coating and intermittent coating. We will show the features and specifications of such flexible OLEDs and the possibilities for obtaining prototypes from the pilot line service, together with the roadmap for future flexible OLED offerings.
Advances in OLED Stack Development Using a Simulation-Assisted Approach
Siebe van Mensfoort | co-founder and CEO of Simbeyond B.V.,
The development of flexible OLEDs involves time-consuming and costly trial-and-error approaches. Although conventional simulation techniques can somewhat accelerate this, their results are not predictive, as they do not appropriately include the interplay between electro-optical processes. Here we show how advanced simulation techniques that include these processes down to the molecular scale are used to predict the electrical characteristics, efficiency roll-off, device lifetime and emission color. The method is applied to next gen OLEDs, and to material types used in flexible OLEDs. This leads to more efficient development cycles, to reduced R&D costs and to a shorter time-to-market.
- Accelerating development of flexible OLEDs for display, lighting and signage applications
- Combining Device Physics, Molecular Engineering and Computer Science competences
- Beyond present tools: at molecular scale, in 3D, from ns timescale to full device lifetime
- Facilitating shorter feedback loops between material suppliers and device manufactures
- Reduced R&D costs and shorter time-to-market
Advanced Inkjet Printing for Manufacturing of Flexible OLED Displays
Dr. June Zhang | Director of Technology Marketing of Kateeva
For many years inkjet printing (IJP) held promise as an OLED manufacturing equipment solution for its precision deposition capabilities, but several critical technical barriers made cost-effective mass production of OLEDs impossible. In 2013, Kateeva disrupted the display industry when it introduced the YIELDjet™ IJP platform. It was the industry’s first IJP system engineered from the ground up for OLED mass production, and featured numerous technical innovations to overcome the challenges that had hindered IJP in the past. When the display industry moved to flexible (curved) OLED displays, IJP was deemed to be the most technically viable approach for the deposition of the organic layer in the TFE stack. The YIELDjet FLEX proved itself to be the most technically advanced and cost effective IJP system for TFE in mass production, and has now been reliably producing flexible OLED displays in high volume for several years. This first part of this presentation will focus on the technical innovations of Kateeva IJP platform and how they enable IJP to play a critical role in flexible OLED mass production today.
The next inflection in the OLED display roadmap is foldable technology, which OLED display manufacturers are developing aggressively. Mass production of foldable OLEDs brings a new set of challenges to many parts of the OLED process, including encapsulation. These challenges and the extendibility of Kateeva’s IJP technology to mass production of foldable OLED will be focus of the second part of the presentation
High-performance Light-Emitting Diodes Based on Coinage Metal Carbene Complexes
Dr. Alexander S. Romanov | Sr. Post-Doctoral Research Associate, School of Chemistry of University of East Anglia
Materials design becomes very important for the successful incorporation of the coinage metal complexes into organic light-emitting diodes (OLEDs) to achieve not only high efficiency and brightness but also flexibility of the OLED devices. A number of the coinage metal carbene complexes have been shown to give rise to photo- and electroluminescent compounds, especially copper based complexes which are particularly attractive since copper is inexpensive and abundant.1,2 We designed efficient emitters based on carbazole dendrons (G0, G1 and G2) and carbene ligand linked by a metal atom for application in the flexible and foldable OLEDs. The zero generation materials are largely crystalline and possess exceptionally high quantum efficiencies (>27% EQE) in solution-processed OLEDs comparable to or exceeding state-of-the-art vacuum-processed OLEDs and quantum dot LEDs. First and second generation dendrimers are not only amorphous materials, which is important towards higher flexibility of the emitting layer, but also possess short lifetime (100-300 ns) for the delayed emission which is important for fabrication of the highly stable and flexible OLEDs.
Bending Tests of Flexible OLED Modules for Lighting and Signage Application
Michael Törker | Senior Scientist of Fraunhofer Institute for Organic Electron Beam and Plasma Technology FEP
Improved stability of OLEDs under repeated bending stress is essential in order to access new OLED applications and markets. Different substrate types are investigated. Bending test results of polymer substrates with barrier layer as well as bending test results of ultrathin glass substrates are compared. Barrier properties and mechanical stability are evaluated. Both types of substrates are suitable for flexible OLED deposition. Stability of polymer and thin glass OLED modules in repeated bending tests are presented.