Idemitsu Kosan developed the world's most efficient fluorescent blue OLED emitter system

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.

Japan Display announces a breakthrough lithographic-based OLED production method

Japan Display (JDI) announced that it has developed a new OLED deposition technology, which they refer to as eLEAP, that is cost effective and can be used to create OLEDs that are brighter, more efficient, and longer lasting compared to OLEDs produced using mask evaporation (FMM). eLEAP also enables OLED freeform deposition. JDI regards its new technology as a " historic breakthrough in display technology".

JDI eLEAP aperture ratio image

eLEAP is based on a lithographic method, and does not require any masks. The main advantage seems to be that OLED displays produced by eLEAP technology can achieve an aperture ratio of 60%, compared with FMM OLEDs which achieve a ratio of about 28%. This means that the OLED displays can be driven at lower currents - which extends the lifetime, improves the efficiency and also enables higher-peak brightness when needed.

LG Display demonstrates a prototype WOLED display with a microlens MLA array

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.

LG Display could adopt a microLens array in its OLED TV panels to boost brightness and efficiency

Reports from Korea suggest 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).

OLED micro-lens array (Michigan)

MicroLens array structure, University of Michigan

According to the report, the project is at an advanced stage, and panels with the microLens array could be introduced by the end of this year. LGD will apply the technology to its OLED.EX panels, so brightness could reach up to 1,200 nits. LGD considers this technology as it faces competition in large-area OLED production, from Samsung's QD-OLED panels, for the first time.

On SEL's ExTET OLED device architecture

In 2016, Researchers from Japan's Semiconductor Energy Laboratory (SEL) announced a new OLED device architecture, called ExTET ('exciplex–triplet energy transfer'), that can increase the performance of OLED devices. The technology was applied for a patent in 2011.

Conventional Vs. EXTeT OLED mechanisms (SEL)

The ExTET technology, which is a modification of the host material and the EML layer in phosphorescent OLED devices, have since been introduced to commercial AMOLED panels, increasing the efficiency and lifetime of the materials, while also lowering the drive voltage.

Toray Research Center to explain its OLED device degradation analysis in an online seminar

Next week, Toray Research Center (TRC) will host an online webinar focused on OLED 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 technologies and analysis of OLED devices.

Toray Research Center TRC banner

One of the topics covered in these online webinars will be the degradation analysis of OLED devices. The researchers at TRC can use nine different techniques to analyze the OLED stack, looking for organic impurities, degradation products, outgas and luminescence properties of an OLED device. The researchers can also look at the sealing property of the encapsulation layer and analyze the OLED device's cathode.

TU/e leads a new research project to develop a strategy to suppress OLED exciton quenching

Eindhoven's Technical University (TU/e) announced a new project called SEQUOIA that aims to develop a strategy for the suppression of exciton quenching in OLED devices.

Exciton quenching, caused due to unwanted interactions among excitons and between excitons and charges, causes the efficiency of OLEDs to drop as brightness increases. The researchers hope to develop new materials and new OLED design to suppress (or hopefully eliminate entirely) this problem.

Researchers use a 3D OLED pixel configuration to increase efficiency by up to 30%

Researchers from National Taiwan University, led by Prof. Chung-Chih Wu, have developed a 3D pixel configuration for OLED devices, which can improve the light extraction. The new design can improve the external quantum efficiency of a top-emitting OLED device by up to 30%.

Reflective 3D OLED pixel configuration (NTU)

The new design uses a 3D reflective pixel structure filled with a patterned high-index material. The researchers created several pixels with difference sizes, and found that the smaller the pixel, the higher the efficiency boost.

ETRI and KAIST researchers developed a new metal oxide charge transfer complex that can enhance OLED device efficiency

Researchers from Korea's KAIST and ETRI institute developed a new metal oxide charge transfer complex that, when dispersed in the OLED stack, can improve the OLED efficiency.

NiO and MoO3 complex (KAUST, ETRI)

The researchers have applied this material to a green and blue OLED device. The current efficiency of the green OLED was enhanced by 189%, while the external quantum efficiency of the blue OLED was improved by 17%.

Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters