Technical / Research - Page 8

Researchers from Korea's KAIST institute developed a fabric-based wearable patch that uses a blue OLED device to treat jaundice in newborns.

The researchers say that phototherapy is the most widely used treatment for neonatal jaundice, as it is a safe and effective to transform the bilirubin that is accumulated in the body and release it. When the bilirubin concentration is too high, the doctors treat newborns with blue light in an incubator. The new device can be used to treat high levels of bilirubin, without the need for an incubator.

Researchers from the University of Cambridge, led by Dr Alex Gillett, have studied the effect of host materials (the dielectric environment) on the performance of TADF OLED emitters, and specifically how the dipole moment of the host material can affect the rISC rate of the TADF component.

The impact of the toluene solvent dynamics on the riSC process of TXO-TPA (left: TXO-TPA in an explicit toluene solvent environment, right: TXO-TPA in vacuum)

The researchers tested several TADF OLED materials, and in some of these materials, the effect of different host materials can be quite dramatic. It is believed that commercial TADF devices could benefit from tuning the host and emitter combination to achieve higher performance, including a better efficiency roll-off as conversion of triplets into singlets can be accelerated.

Toray Research Center (TRC) is now hosting online webinars focused on display technologies. TRC, who supplies technical analysis and support for R&D and manufacturing, invites you to attend the online lectures at no cost, to learn more about OLED, microLED and QD technologies and analysis of OLED devices.

The webinars include recorded presentations, which will be available online up until to November 22. You can register for the webinars here.

The webinar will include three different presentations:

• OLED dopant ratio for efficient emission
• Laser-based processes for microLED production, analysis method to evaluate chips after transfer
• Degradation analysis of QD-LED devices

In the next two weeks, Toray Research Center (TRC) is hosting online webinars focused on display technologies. TRC, who supplies technical analysis and support for R&D and manufacturing, invites you to attend the online lectures at no cost, to learn more about OLED, microLED and QD technologies and analysis of OLED devices.

The webinars include recorded presentations, which will be available online up until to November 22. You can register for the webinars here.

Researchers from China's Shenzhen University are working towards efficient selenium-integrated TADF OLED emitters.

The researchers latest work detailed the structure-activity relationship between heavy atom effects and multiple resonance TADF performance. The researchers say that their new emitters effectively solve some of the issues inherent in TADF emission technology, specifically the sharp drop in emission at high brightness, what is called the emission roll-off.

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.