Technical / Research - Page 9

Researchers from Russia's Ural Federal University developed a new OLED emitters based on cyanopyrazine-enhanced fluorophores. The presence of cyanogroup substance in the composition of fluorophores significantly increases the efficiency of the OLED emitters.

The researchers say that they have modified the pyrazine-based push-pull system with cyanogroup and studied how this affected the photophysical properties of the fluorophores and the performance of OLED devices based on these materials.

Researchers from the Université de Rennes in France have developed a simplified PHOLED green emitter that achieves the world's highest efficiency in single-layer PHOLEDs - an EQE of 22.7%.

The researchers, led by Prof. Cyril Poriel, say that the emissive layer was developed using a rational molecular design. The impact of the phosphorescent emitter on the ambipolarity of the charge transport is particularly evidenced and appear as a key concept in the high performance that was achieved.

This is a sponsored post by INFICON

OLED producers have been struggling with the deposition of magnesium materials during the OLED production process. INFICON has developed high-level magnesium-sensitive crystals specifically for OLED deposition, that significantly shorten the initial time delay in magnesium monitoring, while maintaining high stability and reproducibility.

The following application note details INFICON crystals for OLED deposition, the development process, and the experiments the company performed to characterize and evaluate the crystal quality to make sure it offers the highest possible solution for the OLED industry.

Background

Quartz crystal microbalance (QCM) is one of the most important INFICON products for organic light-emitting diode (OLED) and optical device fabrication, as well as for many other applications. The change in the QCM's resonance frequency due to mass loading by thin films allows it to be used as a surrogate for correlating the rate of the film thickness accumulation on a substrate. The design of INFICON High Precision Sensor Crystals was based upon many OLED manufacturers™ requirement of more stable crystals that are less prone to activity dips (instability in the activity signal) in controlling the deposition of OLED materials. The field performances of INFICON High Precision Sensor Crystals have shown to improve rate stability with nearly extinguished activity dips in terms of the number of occurrences as well as the magnitude when they rarely occur.

A few weeks ago Korea-based Sewon announced that it is entering the OLED-based optical patch business, based on technology developed by Kwangbio and Korea's KAIST institute. The idea is to use OLED panels for phototherapy that can be used to treat pain and encourage skin regeneration.

Sewon E&C now announced that its OLED phototherapy patch, the first such patch in the world, has completed the FDA registration. The company now aims to accelerate the commercialization, and has already secured the site for the production facility. Sewon hopes to bring the patch to the market by the end of 2022 or early in 2023.

This is a sponsored post by Nanomatch

To enable efficient design and improvement of OLED materials and device, the Nanomatch
software computes material properties and parameters such as HOMO, LUMO, excitation spectra,
transition moments, etc. from first principles.

Recent improvements in the ab-initio computation of material parameters enable the accurate
computation of IV and EQE of state-of-the-art OLED devices. This was demonstrated for a recently
reported exceptionally stable blue OLED.

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.