Holst Centre was setup in 2005 by IMEC (Belgium) and TNO (Holland), with government support. The center is located in Eindhoven, and has around 200 employees and over 20 industrial partners.
The center is an independent R&D operation that develops generic technologies for Wireless Autonomous Transducer Solutions and for Systems-in-Foil. One of the programs in the Holst center is ‘Printed Organic Lighting and Signage’ - develops device designs for OLED lighting and signage applications, compatible with roll-to-roll (R2R) processing.
The latest Holst OLED news:
The Fraunhofer FEP institute, the Holst Center and other partners have developed a 15-meter long OLED lighting panel, the longer OLED device ever (beating their own 2017 record of a 10-meter OLED). This work was done as part of the Lyteus, the EU's €14 million initiative within PI-SCALE.
The partners in this project say that this is the first OLED produced using a new unique roll-to-roll (R2R) process that combines the performance of an evaporated OLED stack with solution processing of auxiliary layers.
Fraunhofer, Holst and VTT developed a new flexible OLED lighting bracelet produced at the EU PI-SCALE line
The Fraunhofer FEP, together with VTT and the Holst Center developed a new wearable OLED lighting bracelet, one of the first one of the first flexible organic electronic product to be produced at the European PI-SCALE pilot production line.
The yellow and red OLED deposition in this prototype was performed at the Fraunhofer FPP (which can handle both sheet-to-sheet and roll-to-roll processes), while the barrier web was produced at the Holst Centre. VTT integrated the OLEDs into the bracelet. Such a bracelet, with its low power consumption, could be used as a security device, as a fashion jewelry, and more.
The Holst Centre is demonstrating a new optimized encapsulation (barrier) layer for foldable OLED panels. The new barrier is made from an organic layer sandwiched between two layers of silicon nitride (SiN). These are standard materials, but by optimizing the stack design the researchers at the Holst Centre were able to control its mechanical properties and create a much more flexible barrier.
The Holst researchers used an organic material that can withstand 400 °C and can be applied by slot-die coating. This allows the SiN layers to be deposited at 350 °C, improving their quality and ability to prevent water penetration. The Holst tested the OLED prototypes that use the new barrier for 1,000 hours (in accelerated lifetime testing) and no black spots appeared, even after 10,000 folding cycles (bending radiud 0.5 mm).
Taiwan-based Chunghwa Picture Tubes (CPT), in collaboration with European research institute imec (in the framework of the Holst Centre collaboration) have demonstrated an ultra-high resolution OLED display that was patterned using photolithography - without the need for an FMM (metal mask). A photolithography process offers a high aperture ratio, large substrate sizes and good yield control.
The prototype display that was demonstrated is a passive display with a 1400x1400 resolution (or 1250 PPI!) of side-by-side orange and green OLEDs. imec reports that preliminary lifetime investigation shows operation of each color after patterning for a few hundred hours at more than 50% of the original brightness.
The Holst Center presented a new functional demonstrator that uses the Holst' in-mold electronics (IME) technology to show new human-machine interfaces in automotive electronics and consumer appliances. One of the new technologies embedded in this demonstrator is flexible OLED lighting that is used to illuminate touch controls.
The Holst Center says that this is the first time a flexible OLED has been used to illuminate touch controls. Usually several LEDs, light guides, complex wiring and bulky PCBs are required to achieve this effect. Flexible OLED lighting provides a much easier solution with complete design freedom.
Researchers from the Holst Centre developed a new process to deposit semiconductor layers with better performance and high throughput than PVD-based process. the new process is based on scalable, atmospheric-pressure process spatial-ALD.
The Holst Centre used sALD to deposit IGZO backplanes that achieved charge carrier mobilities of 30 to 45 cm2/Vs. The researchers say that similar backplanes deposited with PVD (supttering) achieve about 10 cm2/Vs. The sALD layers also exhibited low off current, switch-on voltages around 0 V and excellent bias stress stability.
The Holst Centre, in collaboration with US-based ultra-thin ceramics supplier ENrG have managed to produce a flexible OLED lighting panel on a 20-40 um thick ceramic substrate. The researchers at the Holst Centre say that a ceramic substrate offers an excellent barrier, is easy to handle and can withstand the high temperatures used in display backplane manufacturing processes.
The Holst presented the 12 x 2.5 cm prototype OLED lighting panel that you see above. A ceramic substrate can withstand temperatures up to 1000 Celsius - and can be made partially transparent. This could prove to be an interesting alternative to plastic and metal substrates.
The €11-million 3-years European Flex-o-Fab project was launched in January 2013 with an aim to help commercialize flexible OLEDs. The Holst Centre, the project's coordinator, announced that the Flex-o-Fab successfully completed its goals - including developing indium-free electrodes (based on ZTO with a supporting metal grid) and brighter OLEDs (light emission was enhanced by about 30% using a plastic substrate with outcoupling features).
The project used a distributed pilot production line and associated manufacturing chain involving partners and facilities at different locations across Europe. The project partners managed to migrate key processes from sheet-to-sheet processing to roll-to-roll production. .
The €11-million 3-years European Flex-o-Fab project was launched in January 2013 with an aim to help commercialize flexible OLEDs. The researchers working on this project have now successfully fabricated a flexible OLED prototype in a roll-to-roll (R2R) process.
The OLED prototype (shown above) was produced on a PET plastic film, and the researchers say this is a significant breakthrough on the way to commercial production. It uses technologies developed as part of the Flex-o-Fab project in addition to the Holst Centre's own high-performance flexible barriers for organic electronics.
In the past two years, Evonik and the Holst Centre has been developing a new soluble Oxide-TFT material and a slot-die coating deposition process. Evonik is now commercializing the so-called iXsenic S material. In fact Evonik says that a key customer is introducing the product in a mass production display fab (it is unknown if this line produces OLED or LCD displays).
Evonik says that their new material offers a performance good enough for high-resolution OLED and LCD displays, and it can be deposited in a coating process which lowers production costs.