OLED displays use organic materials that emit light when electricity is applied. OLEDs enable emissive, bright, thin, flexible and efficient displays. OLEDs are set to replace LCDs in all display applications - from small displays to large TV sets.

UDC OLED material performance, 2012

One of the main problems of OLED displays is the limited lifetime of the OLED materials. In past years we have seen great advances in this area, and today OLED materials are quite long lasting - with material lifetime reaching million hours or more.

Blue OLED lifetime

A blue OLED emitter is the most unstable emitter, and blue OLEDs (required to create a full-color display) suffer from short lifetimes. This is especially true for the efficient phosphorescent blue emitter - and today there's still no commercial efficient blue emitter.

Bright blue PHOLED (University of Michigan)

The OLED industry is seeking several routes to develop an efficient blue. PHOLED pioneer Universal Display is developing a blue PHOLED, but has yet to find a commercial-ready material. Other promising route is TADF emitter technology.

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The latest OLED lifetime news:

Researchers develop promising near-UV CMAc OLED emitters

Researchers from the University of Manchester, led by Prof. Alexander Romanov, developed a promising new Carbene-Gold-Arylacetylide (CMAc) OLED near UV emitter type. The researchers also detail a strategy to develop longer device lifetimes for such emitters.

The new emitter exhibits an efficiency of 1% EQE, and a lifetime of 20 minutes at a practical brightness of 10 nits (LT50). This is low compared to commercial OLEDs - but it is actually quite outstanding for such an emitter, and the researchers say that this is among the longest lifetimes for a near UV-OLED at a practical brightness ever reported. In addition, organic fluorescent and TADF emitters rarely exceed 1% EQE at practical brightness.

Read the full story Posted: Sep 06,2023

Researchers find that adding an ultra-thin metal layer can dramatically enhance the lifetime of tandem OLED devices

Researchers from South China University of Technology and Guangzhou New Vision Opto-Electronic have found that the lifetime and current efficiency of a tandem OLED device can be greatly improved by adding an ultra-thin Ytterbium (Yb) metal layer through the charge generation layer (CGL).

The experiments detail an ultra-thin Yb metal layer with low work function, high transmittance, and large atomic radii, added to a light-green tandem OLED devices. The new device exhibited a lifetime of 308 hours (T90) at an initial brightness of 10,000 cd/m2 - which is 362 times (!) longer than that of a similar device without the Yb layer (T90 = 0.85 hours). The lifetime of the same material in a single-layer configuration (not a tandem device) was 49 hours (T90).

Read the full story Posted: Aug 24,2023

DSCC: the AMOLED material market to resume growth in 2023, to reach $2.18 billion in 2027

DSCC expects the AMOLED stack material market to grow 4% in 2023, to $1.4 billion, and to reach $2.18 billion in 2027, that's a 12% CAGR from 2023 to 2027. In 2022, the market declined by 10%. The forecast does not include any UDC revenues from blue PHOLED materials, which means that if UDC succeeds in commercializing its blue material, revenues could be higher by hundreds of millions of dollars.

DSCC says that demand for OLED TVs will continue to decline in 2023. In 2022, revenues of OLED TV revenues declined by 17%, and in 2023 revenues will decline 3% further. Growth will resume, though, in 2024, and in 2023-2027 the market will grow at a CAGR of 13%.

Read the full story Posted: Jul 13,2023

Excyton wins an I-Zone innovation award at SID Display Week 2023, concludes a successful event

UK-based Excyton has won an I-Zone innovation award at SID Display Week 2023, a great testimonial to the interest in the display industry for its novel OLED and microLED pixel architectures.

Excyton concludes a very successful display week. The company's CEO, Peter Levermore, gave a presentation explaining the company's TurboLED display architecture, detailing how the technology works and the simulations the company has performed. The company also had a booth at Display Week's I-ZONE section, where it demonstrated red, green and blue TurboLED devices powered by both deep-color and light-color emitters. In fact the company says that its demonstration attracted a lot of interest from the industry, and it had many constructive meetings during the week that it is following up on to start commercial collaborations in the near future.

Read the full story Posted: Jun 15,2023

Researchers reach 100% IQE with a single-layer TADF device, getting closer to commercial viability

A few months ago we reported on research conducted at Germany's Max Planck Institute, led by Prof. Paul W.M. Blom, that looks into single-layer OLED devices. In such devices, a single TADF OLED emitter layer is sandwiched between two electrode - a much simpler design compared to commercial OLED devices that use multilayer stacks, sometimes with 10 or more layers.

The researchers the the MPI say that in fact it is possible to develop highly efficient OLEDs with just the TADF emitter, as there's no fundamental reason or major benefits that arise from multilayer OLEDs. The researchers continue their work, and now they have developed a new single-layer blue OLED in which every injected electron is converted into a photon - or 100% IQE. This is the first time that such a single-layer OLED device was demonstrated (see image above).

Read the full story Posted: Jun 04,2023

Visionox new ViP OLED technology uses photolithography-based patterning to increase display performance

Visionox is introducing a new OLED production technology, called Visionox Intelligent Pixelization (or ViP for short) that enables higher-density display production, at over 1,700 PPI.

The idea behind ViP is to replace the fine metal mask (FMM) method with photolithography-based pixel patterning. The process offers several advantages, mainly the increase of aperture ratio to almost 70% (Visionox says the currently reach 69%). FMM methods usually achieve up to 30%, which means that brightness, efficiency and lifetime can all be increased.

Read the full story Posted: May 10,2023

LG Display and Samsung Display are both working on special glass-TFE OLEDs for Apple's future iPads

Apple's interest in OLED displays for future iPad tablet device is not secret, and many analysts estimate that the first such device will be released in 2024.

One of Apple's requirement is for superior performance for its tablets compared to smartphone AMOLED displays - and so developers are relying on a tandem OLED structure. According to a new report from Korea, LG Display is developing another unique technology for Apple's iPads.

Read the full story Posted: Apr 18,2023

A report suggests that Samsung Display is interested in JDI's eLEAP OLED deposition technology

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

JDI eLEAP aperture ratio image

According to a new report from Korea, Samsung Display is interested in JDI's new technique. Interestingly the report shows conflicting views within SDC - some are interested in adopting this new technology, especially at SDC's upcoming 8-Gen IT OLED production line, while others are more interested in preventing SDC's competitors (JDI, or others?) from using it, perhaps by pressuring OLED equipment makers to not offer needed equipment to JDI.

 

Read the full story Posted: Sep 21,2022

Computing material properties for OLED device simulations

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.

Ab-initio simulation of blue OLEDs, Nanomatch

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.

Read the full story Posted: Aug 22,2022