Blue color

UK researchers discover a low-cost high-performance blue OLED host material

Researchers from the University of Manchester and the University of Cambridge, led by Prof. Alexander Romanov, have discovered a new class of OLED host material, that is highly efficient and also is very easy to synthesize, and thus could be very cheap to produce.

Compared with PPBI, one of the popular hosts for blue OLEDs, the new 1,3,5-oxadiazines (NON) materials possess the same or improved characteristics, such as wide band gap and high triplet state energy up to 3.3 eV, whilst costing 100 times less after sublimation. Dr Hwan-Hee Cho from Optoelectronics Group at the University of Cambridge performed the first tests in deep-blue OLED architecture to demonstrate that NON-hosts can result in up to 21% EQE at practical brightness with CIE colour coordinates (0.17, 0.16) – outperforming other commonly used hosts in the same device stack. NON-host materials and their further derivatives have a strong potential for the OLED community to unlock high-performance electronic displays.

Read the full story Posted: Feb 03,2025

LG Display's latest WOLED panels reach 4000 nits, the company details the META 3.0 technology behind it

Last week LG Electronics officially launched its 2025 OLED TV range, where some of the high-end models reaching 4,000 nits. LG Display today unveiled the technology behind these new OLED displays.

LGD's so-called META 3 WOLED panels (which are the company's 4th-gen WOLEDs) achieve 33% higher brightness to each a maximum of 4,000 nits. The new panels adopt a new stack structure that has two layers of blue emitters and two more layers, one with red emitters and one with green emitters. LGD refers to this architecture as a "Primary RGB Tandem structure". 

Read the full story Posted: Jan 16,2025

Noctiluca signs a JDA with TCL CSoT's Juhua to develop TADF emitters, upgrades to the main stock exchange in Poland

Poland-based OLED material developer Noctiluca announced that it has signed a joint development agreement (JDA) with a subsidiary of the world’s second-largest TV manufacturer and a leader in display technology from China, focused on industrializing printed OLED technologies. This is likely to be TCL CSoT's Juhua printing subsidiary. TCL CSoT recently started to produced inkjet printed OLEDs.

Noctiluca and TCL CSoT will work together to adopt Noctiluca's proprietary chemical compound into TCL's OLED displays. The company does not detail what kind of materials will be tested in this agreement. The company develops both TADF/HF OLED emitters and also EIL materials for blue OLED emission.

Read the full story Posted: Dec 19,2024

Researchers use a high-output flexible QD-OLED patch to encourage hair growth

Researchers at Korea's Gachon University, in collaboration with InnoQD and researchers from Chungbuk National University, have developed a new QD-OLED patch that can encourage hair growth. The patch can also measure heart rate at the same time.

The researchers used a flexible OLED device, and covered it with quantum dots that emit near-infrared (NIR) light. The OLED device is a tandem blue OLED device, that offers a high light output. The researchers say that when attached to the head, the patch encourages hair collicle cell growth, with a measured improvement of 23% in hair growth.

Read the full story Posted: Nov 03,2024

Researchers from SNU and Samsung identify a critical mechanism in OLED performance degradation, and use the knowledge to dramatically improve OLED efficiency and lifetime

Researchers from Seoul National University (SNU), in collaboration from colleagues from Samsung's SAIT institute, have identified a critical mechanism behind the performance degradation of OLED devices, the interfacial exciton-polaron quenching mechanism.

The researches have theoretically proposed a mechanism where excitons in the light-emitting layer are quenched by the accumulated charges at the interface. They followed with with experiments that have independently observed this phenomenon, identifying three key factors: interfacial barrier, exciton-polaron distance, and exciton lifetime. 

Read the full story Posted: Oct 30,2024

Researchers from Korea develop a new OLED intermediate layer material to improve the performance of blue phosphorescence OLED emitters

Researchers from Korea's UNIST institute, together with colleagues from Sungkyunkwan University have developed a new OLED intermediate layer material (with a highly unusual structure, twisted EBMs with anisotropic molecular arrangements) that significantly improves the brightness, efficiency and lifetime of blue phosphorescence OLED devices.

The researcher report that the new materials enable to reduce the operating voltage of the OLED display, thus enhancing the power efficiency by 24% and the operational stability by 21%. The researchers say that this new material can also be used for in-organic LEDs (including microLEDs).

Read the full story Posted: Oct 02,2024

Lordin reports on a highly efficient and stable ultra-pure blue phosphorescent OLED emitter

Researchers from LORDIN, in collaboratioon with researchers from Korea's Dankook University, Gachon University and Hongik University, have reported on a highly efficient and stable ultra-pure blue phosphorescent OLED emitter, based on Lordin's Tetradentate Pt(II) material Complex with a vibration suppression effect.

The researchers say that the new emitter offers a lifetime of 451 hours (LT50 at 1,000 cd/m2), and an EQE of 25.1%. The emission spectrum is extremely narrow - full width at half a maximum of 22 nm. The researchers further developed a tandem OLED device based on this new emitter, which achieves an EQE of 50.3% and a lifetime of 589 hours (LT 70).

Read the full story Posted: Sep 19,2024

Researchers design a highly promising host material for blue TADF OLED devices

Researchers from National Taiwan University, together with colleagues from Yuan Ze University, National Dong Hwa University and Academia Sinica, have developed a very high efficiency blue TADF OLED device, by adopting a favorable horizontal oriented host material.

The researcher designed a new host material (4Ac26CzBz) that is made from acridan and carbazole moieties linked to a benzimidazole core. The host material exhibits a wide optical gap (Eg) and high triplet energy (T1) of 3.3 and 3.0 eV, respectively. The researchers used 4TCzBN as the blue-light TADF dopant, and report a remarkably high device external quantum efficiency of 35.8 % (59.8 cd/A and 62.8 lm/W) and a low turn-on voltage (<3 eV). The device features with significant suppression of the efficiency roll-off, maintaining a high efficiency of 29.7 % as luminance at 1000 cd/m2.

Read the full story Posted: Sep 12,2024

Samsung Display plans to adopt new technologies with an aim to cut the power consumption of OLEDs by over 50%

During iMID 2024, Samsung Display's eVP Yi Chung said that the company plans to reduce the power consumption of its OLED panels by over 50%. SDC is developing several technologies, each contributing to the same efficiency goal.

SDC did not detail its plans exactly, but it did mention some of the new technologies it is working on - polarizer-free OLEDs (these have been commercialized already), multi-frequency driving (demonstrated by other OLED makers), tandem OLED architecture and the adoption of high efficiency blue PHOLED emitters.

Read the full story Posted: Aug 26,2024

LG Display to soon commercialize a tandem architecture blue phosphorescence OLED display

A report from Korea says that LG Display has successfully developed an OLED panel that is based on a blue phosphorescence emitter. The blue PHOLED, provided by Universal Display, offers 100% IQE, up from 25% used by current fluorescence emitters. This will result in around 20-30% power saving for the display itself (depending on the images shown).

A 13-inch tandem laptop OLED panel, LG Display

UDC has been developing blue emitters for many years, and recently the company said that the development will take a few more months and won't be ready in 2024. The main challenge is increasing the lifetime of the materials. However LG Display has adopted a tandem design to enable a commercially ready display, perhaps even sooner than UDC planned.

Read the full story Posted: Aug 22,2024 - 1 comment