Technical / Research

Is current OLED architecture obsolete? An interview with the head of Germany's Max Planck Institute

Researchers from Germany's Max Planck Institute, led by Prof. Paul W.M. Blom, are looking into single-layer OLED devices (in which a single emitting layer is sandwiched between two electrodes), with an aim to match their efficiencies to those of common multilayer OLED stacks, like the ones used in commercial OLED displays.

Current OLED architectures utilize multilayer stacks of materials, in order to increase the performance and lifetime of OLED devices. But according to the latest findings by Prof. Blom, equal efficiencies can indeed be met with single-layer TADF OLED emitters - and there's no fundamental reason or major benefits that arise from multilayer OLEDs.

Read the full story Posted: Feb 02,2023

ICCAS chooses Notion Systems' inkjet printing solution to research organic materials for display appllications

Industrial inkjet printing developer Notion Systems announced that is has been selected by the Institute of Chemistry, Chinese Academy of Sciences (ICASS) for organic material R&D. Notion Systems worked together with its partner YixinTech as its system went through a long comparison against other inkjet printers in the market.

ICCAS is a multi-disciplinary research institute dedicated to basic research in broad fields of chemical sciences. One of its major research areas is organic materials for display applications.

Read the full story Posted: Jan 30,2023

LG Display may start producing microlens MLA WOLED panels by 2024

In May 2022 we reported 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). According to a new report from Korea, LGD is progressing in its project and estimates that the first MLA (Micro Lens Array) OLED panels will enter production in 2024.

OLED micro-lens array (Michigan)

MicroLens array structure, University of Michigan

The original report in May stated that LGD could actually begin producing MLA OLEDs as early as in 2022 - but it seems as this was overly optimistic. Earlier this year, LGD demonstrated a 77" 8K MLA WOLED panel.

Read the full story Posted: Dec 06,2022

Researchers suggest using a wearable blue OLED device to treat neonatal jaundice

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

Blue OLED treatment for neonatal jaundice (KAIST)

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.

Read the full story Posted: Nov 23,2022

Researchers suggest using the dipole moments of TADF host materials to increase emission performance

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.

University of Cambridge: the impact of the toluene solvent dynamics on the riSC process of TXO-TPA

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.

Read the full story Posted: Nov 15,2022

Toray Research Center to host an OLED technology webinar to discuss dopant ratios

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.

Toray Research Center TRC banner

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

Read the full story Posted: Nov 15,2022

Toray Research Center to host an OLED, MicroLED and QD technology webinar

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.

Toray Research Center TRC banner

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

Read the full story Posted: Nov 08,2022

Researchers from Shenzhen University designed efficient selenium-integrated TADF OLED emitters

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.

Read the full story Posted: Oct 28,2022

Researchers develop new highly-efficient cyanopyrazine-enhanced fluorophores OLED emitters

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.

OLED based on push-pull-systems from cyanopyrazine compounds (Ural Federal University)

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.

Read the full story Posted: Oct 21,2022

Researchers develop the world's most efficient single-layer PHOLED emitter

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%.

Simplified green single-layer phosphorescent OLED (Universite De Rennes)

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.

 
Read the full story Posted: Oct 14,2022