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An interview with Idemitsu Kosan's electronic material's chief

Jan 05, 2016

Hajime Nakamoto (Idemitsu Kosan)Idemitsu Kosan is a large multinational Chemical company based in Japan that is supplying OLED materials for OLED producers. Idemitsu has OLED business units in Japan, Taiwan, Korea and China and is collaborating with UDC, LGD, AU Optronics, Doosan and others.

Hajime Nakamoto, the head of the Electronic Materials Department at Idemitsu was kind enough to answer a few questions we had. Mr. Nakamoto joined Idemitsu in 1984 and has been involved with OLEDs since 2007.

Q: Hajime, Thank you for your time. Idemitsu has been one of the leaders in OLED materials for a very long time. Can you tell us what kind of materials you currently offer for OLED panel makers?

Idemitsu offers almost all kinds of OLED materials to OLED panel makers. Idemitsu is particularly well-known for its fluorescent blue host and dopant materials and transport materials, which offer advantages to OLED panel makers.

BASF hopes to release a long lasting phosphorescent blue emitter in 2014, to open an OLED lab in Korea

Oct 10, 2013

BASF has been working on a blue phosphorescent OLED emitter for quite some time - in fact the company says they have started developing an iridium-based blue PHOLED as early in 2003. Now Karl Hahn, a senior VP at BASF, says that the company will be ready to launch a commercial blue phosphorescent emitter by the end of 2014 aimed towards OLED lighting panels.

During the same presentation, Karl Hahn said that BASF plans to open a new OLED display focused laboratory in Korea during 2014.

Blue PHOLED breakthrough: researchers manage to extend the lifetime tenfold

Sep 25, 2014

Researchers from the University of Michigan developed a new phosphorescent OLED (PHOLED) emitter that extends the lifetime by a factor of 10. Researchers have been trying to develop an efficient, long-lasting blue PHOLED emitter for years now, and this may be the breakthrough everybody's been waiting for.

UoM Blue PHOLED demonstrator photo

OLED makers SDC and LGD already use red and green PHOLED emitter materials in their OLED panels. While phosphorescent emitters do not last as long as fluorescent emitters, they are much more efficient. All commercial OLED displays currently use a fluorescent blue emitter as the best PHOLED blue to date only lasted for a few hundred hours.

CDT Achieves 100,000 Hour Blue Polymer Lifetime

May 23, 2005

CDT logoCambridge Display Technology (CDT) announces the achievement of another important milestone with the development of blue polymer OLED emitting devices with 100,000 hours lifetime* from an initial luminance of 100cd/m2.

This latest announcement is one of a series which CDT has made to enable the industry to chart its progress on this key parameter. Figures of 30,000, 70,000 and 80,000 hours (all from 100cd/m2) were published in May, October and December 2004.

CDT and Sumation Announce Improved Performance Characteristics of Green and Blue P-OLED Materials

May 22, 2007

Cambridge Display Technology and Sumation are pleased to announce new and improved results for green and blue P-OLED materials.

Data from spin coated devices using a common cathode and a recently developed solution processable green P-OLED material demonstrate lifetimes(1) of 50,000 hours from an initial luminance of 1000 candelas per square meter, or cd/sq.m. This is equivalent(2) to over 285,000 hours from an operating brightness of 400cd/sq.m for this material and represents a 40% increase in lifetime compared to results announced on March 27, 2007.

Blue materials have now been developed with a demonstrated lifetime(1) of 10,000 hours from an initial luminance of 1000 cd/sq.m (or 62,000 hours from an operating brightness of 400cd/sq.m) and a deeper color. CIE chromaticity coordinates for previously reported blues were x=0.14, y=0.21, whereas the latest materials are much deeper (x=0.14, y=0.19). Developing red, green and blue materials with the right color point is particularly important for full color display applications from which richness of color is increasingly being expected and demanded by consumers.

CDT and Sumation Announce Strong Lifetime Improvements to P-OLED Material

Mar 27, 2007

Cambridge Display Technology (CDT) and Sumation are pleased to announce new growth in lifetime metrics for red, green, blue, and white P-OLED materials.

Data results from spin coated devices using a common cathode and solution processable materials developed in 2006 demonstrate that lifetimes(a) of 24,000, 35,000, 10,000, and 5,200 hours for red, green, blue, and white, respectively, have been achieved from an initial luminance of 1000 candelas per square meter, or cd/sq.m. This is equivalent(b) to over 150,000, 198,000, 62,000, and 27,000 hours from an operating brightness of 400cd/sq.m for these materials.

The latest figures represent a 5x, 11x, 6x, and 5x improvement for red, green, blue and white materials, respectively, compared to lifetimes reported at the end of 2005. In the case of blue, lifetime has been increased by 2.5x in the short time since the last announcement in November 2006.

CDT announces another lifetime milestone : 400,000 hours for Blue

Nov 16, 2006

CDT logo

Just two months after announcing a significant improvement in blue polymer lifetimes, Cambridge Display Technology (CDT) [Nasdaq: OLED] and Sumation® announced another lifetime milestone for blue light emitting polymers.

Data from devices produced using these latest, solution processable, fluorescent materials show lifetime1 of 25,000 hours from an initial luminance of 400cd/m², equivalent to 400,000 hours from 100cd/m².

This represents a 25% improvement over the lifetime results announced in September.

Production of video capable OLED displays requires a full color range of red, green and blue with long lifetime and good efficiency. The efficiency of this fluorescent blue material is approximately 9cd/A, and the color co-ordinates are: (CIEx=0.14, y=0.21).

CDT announces two major P-OLED development milestones

Dec 12, 2005

CDT logoCambridge Display Technology (CDT) announces two major milestones in the development of long lifetime, high efficiency light emitting polymers for full color, video capable displays.

A phosphorescent red device has been produced by CDT and Sumitomo Chemical which has a lifetime of half a million hours from an initial luminance of 100cd/m(2); this is a record for lifetime of solution-processable materials of any color. The efficiency is also improved at over 7cd/A. Red efficiency is especially important as this color consumes the largest share of power input in a color device, so improvements in red efficiency have important practical implications.

CDT Sees Further Rapid Progress In Polymer Lifetime Development

Mar 13, 2006

CDT welcomes the announcement by Sumation™ - its joint venture partner with Sumitomo Chemical - of rapid progress in the development of long lifetime, high efficiency light emitting polymers for full color, video capable P-OLED displays.

Following a previous announcement in December, CDT now reports the achievement of blue fluorescent devices (CIEx=0.14, y=0.21) with 12,500 hours lifetime(1) from an initial luminance of 400cd/m², and an efficiency of 9cd/A.
Also announced are solution processable red phosphorescent devices (CIEx=0.67, y=0.32) with 50,000 hours lifetime(2) and an efficiency of 11cd/A.

CDT also welcomes the announcement of a green material with color co-ordinates (CIEx=0.36, y=0.60), which represents a more saturated color than previously available from this class of material. Materials with strong colors are important in the design of full color displays with good efficiency and lifetime characteristics. Lifetime achieved for this material is 50,000 hours(3) with an efficiency of 16cd/A.