Technical / Research - Page 9

Korea-based Sewon NC announced that it is entering the OLED-based optical patch business, based on technology developed by Kwangbio and Korea's KAIST institute.

We do not have many details, but apparently Professor Kyung-cheol Choi from KAIST developed OLED optical patches for phototherapy that can be used to treat pain and encourage skin regeneration. Following an investment agreement, Sewon NC has secured the rights to produce and sell the OLED patches.

Researchers from the Polish Academy of Sciences (PAS) and from the Silesian University of Technology have developed new OLED emitter materials based on aromatic electron-donating and -accepting moieties bridged by an antiaromatic seven-membered ring.

The researchers say that the new design of its N-doped PAHs is very flexible, and their properties are very responsive to the choice of the electron-accepting group. The researchers can thus can tune the emission mechanism between TADF emission and room temperature phosphorescence (RTP) emission, which gives high degree of control over the emission profile.

In February 2022 we reported that Samsung Display launched a new platform for OLED material simulation, called Sync-OLED, which is used to evaluation OLED material characteristics before they are synthesized, to help speed up R&D projects.

According to a new report from Korea, the new software platform have started operating, and is already in use by three companies. Sync-OLED, developed by Samsung and the KISTI institute, runs on a supercomputer called Nurion located at the KISTI Super Computing Application Centre. Samsung offers access to the software to small and medium OLED material research companies. Samsung's partners have access to the software at no cost.

Idemitsu Kosan announced that it has developed the world's most efficient blue fluorescence OLED emitter system. Idemitsu's new system achieves an EQE of 14% (at current density of 10 mA/cm²), a lifetime of over 400 hours (LT95 @ 50 mA/cm²) and a color point of (0.14,0.08).

The new material system uses a tandem structure of two blue OLED emitter layers. Idemitsu says that by separating the region that causes charge recombination and utilizing TTF (Triplet-Triplet Fusion) it managed to achieve the high light output.

As we reported last week, LG Display is developing OLED TV panels that utilize a microlens array to increase the light output. LGD unveiled its first prototype display at SID Displayweek 2022.

LGD is showing a 77" 8K panel that features what the company refers to as Meta-lit Lens Array, or MLA technology. The MLA layer increases light output by more than 20%, and the panel achieves a brightness of 2,000 nits. LGD says that the viewing angles is also increased using the MLA technology.

Researchers from the Korea Institute of Science and Technology (KIST) suggest a new method to inspect OLED emitter materials, using terahertz wave spectroscopy.

The researchers say that this method can be used to analyze the transmission characteristics of the OLEDs, without any damage to the materials. This is unlike current fluorescence test methods that harm the OLEDs because of the ultraviolet rays which changes the characteristics.

Canada-based OTI Lumionics started shipping its 2nd-gen ConducTorr Cathode Patterning Materials (CPM) by the end of 2020 to customers, which are used to create OLED displays with under-the-display camera and face unlock technologies.

OTI Lumionics now announced that it signed an agreement with EVM OLED mask maker Dai Nippon Printing. Dai Nippon will optimize its EVM masks for the deposition of OTI's CPM materials.

Reports from Korea suggest that LG Display is looking into adopting a microLens array in its large OLED TV panel architecture. The microlens layer could boost brightness by up to 20%, which will also increase efficiency (if brightness is kept as before).

MicroLens array structure, University of Michigan

According to the report, the project is at an advanced stage, and panels with the microLens array could be introduced by the end of this year. LGD will apply the technology to its OLED.EX panels, so brightness could reach up to 1,200 nits. LGD considers this technology as it faces competition in large-area OLED production, from Samsung's QD-OLED panels, for the first time.

This is a sponsored article by Nanomatch

Recent applications of the Nanomatch Toolkit to improve OLEDs:

• Charge carrier mobility
• Charge screening in OLED materials
• Doping
• Excited states in molecular thin films

Attend our talk at SID Display Week (Session 28 on May 11 2022, 10:40 AM) for further information.

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Researchers from the Korea Advanced Institute of Science and Technology (KAIST) developed a white OLED device that can be deposited on thin fabrics. The researchers say that this is the world's first such device, as previous white OLEDs, made using a tandem structure, could not be bent on fibers.

For the new device, the researchers developed a single white light-emitting layer. The brightness of the device is up to 700 nits, with an efficiency of 10 candelas per ampere.