Technical / Research - Page 2

Researchers from Korea's Yonsei University developed a new highly-promising stretchable OLED device by sequential coating technique. The new device can stretch up to 70% and maintain 80% brightness after 300 cycles at 40% strain. The OLED offers a maximum brightness of 3,151 nits and a total current efficiency of 5.4 cd/A.

The researchers say that standard stretchable OLEDs (what they refer to as intrinsically-stretchable OLEDs, or is-OLED) suffer from reduced performance due to orthogonal solvent problem and also the standard lamination process may cause defects and delamination. The new technique overcomes these issues.

DiaDEM is a platform to boost the development of organic electronics, providing a one-stop-shop solution from digital discovery to experimental verification. DiaDEM comprises an exhaustive database of materials with optoelectronic properties, advanced scientific models for refinement and direct link to the supply chain for efficient procurement of materials for in-house validation. The platform is now ready for beta testing and looking for beta-testers from both academia and industry. Sign up as beta-tester and secure your free DiaDEM credits.

The DiaDEM platform is developed in an EIC Transition-Open project (Grant Agreement No 101057564) by the University of Liverpool (UK), Nanomatch GmbH (Ger) and Mcule.com Kft. (HUN).  DiaDEM revolutionizes R&D in organic electronics (OE) by providing a digital platform to rapidly identify molecules with the desirable combinations of properties and procure the materials for testing to solve three key challenges in OE R&D: (i) design of molecules is limited to chemical intuition and repeated trial & error, with no way to efficiently find materials with desired properties, (ii) there is no efficient way to assess if materials or combination of materials exhibit desired properties when embedded in a device; experimental investigation requires laborious synthesis, purification, device fabrication and measurement; application of advanced computational models requires high-level expertise in underlying science, command-line tools and high-performance computers, (iii) lack of immediate supply of identified candidates prevents rapid experimental validation.

August 7th, 2024 10:00 AM PT / 1:00 PM ET / 6:00 PM BST / 7:00 PM CEST

The rapid evolution of display technology requires the use of cutting-edge research methods to maintain progress. Industry innovators such as Panasonic, Samyang, and Samsung are adopting Schrödinger’s digital chemistry platform to drive innovation in their organic electronics R&D.

This webinar, “Leveraging atomistic simulation, machine learning, and cloud-based collaborative ideation for display materials discovery” will explore the union of physics-based simulations, machine learning (ML), and cloud-native collaboration and informatics tools in revolutionizing R&D innovation for display materials.

Researchers from Osaka University have found that thienyl diketone, a new organic molecule, shows high-efficiency phosphorescence, and one that is more than ten times faster than traditional organic phosphorescence materials. Such a material could hold promise for highly-efficient phosphorescence emission without the use of heavy metals. 

The researchers explain that phosphorescence occurs when a molecule transitions from a high-energy state to a low-energy state, and it often competes with non-radiative processes (i.e. heat generation instead of light). This competition with the non-radiative process leads to slow phosphorescence and lower efficiency. This is solved by adding heavy metal into the emitter - but this new breakthrough achieves fast emission without the heavy metal.

Canada-based OLED material developer OTI Lumionics announced a strategic partnership with Nord Quantique,  a quantum computing company. The two companies will work on electronic structure calculations, vibronic spectra and ab initio molecular dynamics (AIMD) using quantum simulations. The objective of this testing is to identify improved efficiencies for the development of advanced materials.

OTI and Nord Quantique will look at several applications - including semiconductors, pharmaceuticals and specialty chemicals - and also displays. Specially for the OLED industry, the methods developed during the project will be used to simulate optical and some thermal thin film properties, with an initial focus on emitters and OLED stack materials.

Researchers from Korea's KAIST, ETRI, and Dong-A University propose a new stretchable OLED display architecture, based on a 3D form that includes hidden sections that act both as active emitting areas and interconnectors. The idea is that as the OLED display is stretched, these areas pop into place and add to the emitting area of the OLED. The areas are basically hidden pixels that are only used when the display stretches.

To create this OLED device, the researchers attached ultrathin OLED films to a 3D rigid island array structure through quadaxial stretching, enabling precise, deformation-free alignment. The researchers explain that a portion of the ultrathin OLED is concealed by letting it ‘fold in’ between the adjacent islands in the initial, non-stretched condition and gradually surfaces to the top upon stretching. 

Researchers from the University of Manchester, University of Cambridge and University of Eastern Finland, led by Dr. Alexander Romanov have developed a new deep-blue Carbene-Metal-Amide (CMA) OLED emitter material with promising operating lifetime.

The emitter is based on a a new CMA complex with a rigid amide donor, benzoguanidine. The researcher say that the new design unlocks bright charge-transfer deep-blue emission with 100% photoluminescence quantum yields. The excited state lifetimes of the new CMA complexes are among the lowest reported to date among all TADF emitters
(down to 213 ns), resulting in remarkably fast radiative rates of up to 4.7 × 10 6 s⁻¹ . 

Researchers from Chung-Ang University developed a new AI model to predict the characteristics of blue OLED devices. The new model is highly accurate - and achieved a prediction accuracy of 99.2% for the triplet fusion rate constant and 99.9% for the triplet emission rate.

To develop this model, the researchers first developed modeling that improved the calculation accuracy of the triplet emission ratio, one of the key properties of blue light emitting materials. Based on this modeling, an AI model was created to predict the triplet emission ratio and fusion rate constant by generating a transient EL extinction curve.

Researchers from the University of Science and Technology of China (USTC), in collaboration with scientists from the University of Cambridge and Beijing Information Science and Technology University developed a novel blue OLED emitter design, based on 5Cz-BO molecules, that offers highly efficient emission with a narrow emission spectrum.

The new OLED emitters incorporate multiple carbazole donor groups into the multiple resonance (MR) type electron acceptor units. This design offers narrow-band short-range charge transfer excited states and it also reduced the energy level difference between the molecule’s singlet and triplet states.

LG Display developed a new OLED microdisplay (OLEDoS) that achieves a brightness of 10,000 nits. This development is presented at SID DisplayWeek 2024. 

To achieve this high brightness, LG Display's research team used newly-developed high performance OLED materials, and also used a micro lens array (MLA) to expand the light output from the device.