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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.

ITRI developed a highly efficient blue OLED emitter based on plasmon-coupled green PHOLED

Nov 26, 2015

Taiwan's ITRI research institute developed a long-lasting OLED blue emitter. The researchers used a green phosphorescent emitter with a new double metal structure - that emits a blue light. The so-called Plasmon-Coupled Organic Light Emitting Diode (PCOLED) structure's lasts 27 times as long as a blue fluorescent emitter.

ITRI PCOLED diagram

The researchers explain that a regular green phosphorescent emitter always emits a very weak emission. By using the double-metal structure, more plasmons are generated which means a larger blue emission. This is not an up-conversion process - but merely a change in conditions within the green material. This condition was actually discovered by accident.

Researchers develop an efficient deep-blue PHOLED

Oct 21, 2015

Researchers at the University of Michigan developed a new deep-blue energy-efficient phosphorescent OLED (PHOLED) emitter. The researchers say that this is the brightest deep-blue PHOLED ever reported - in fact it is about 10 times brighter than previous deep-blue PHOLEDs. The lifetime of this material is still very low, and future research will attempt to stabilize the molecule.

Bright blue PHOLED (University of Michigan)

The new emitter is based on a N-heterocyclic carbene iridium-III complex molecule. This is an efficient compound because its design reduces the chances that light-emitting excitons will either get lost as heat or destroy the compound itself. This research is sponsored by Universal Display Corporation and the U.S. Air Force.

Will graphene doped with boron unlock efficient blue OLEDs?

Jun 12, 2015

Researchers from Germany's Goethe University discovered that graphene doped with boron atoms feature an intensive blue fluorescence - which means that this new material may prove to be useful in OLED devices.

Boron-laced graphene emit intensive blue light image

The Boron doping changes the graphene in two ways. First of all, it shifts the fluorescence into the desirable blue spectral range. It also improve the capacity to transport electrons. The new material is reportedly not sensitive to oxygen and moisture, unlike most boron-containing graphenes.

The DoE details the four OLED projects that received $3.8 million in funding last week

May 12, 2015

A few days ago, the US Energy Department (DoE) announced its tenth round of efficient SSL lighting awards, awarding more than $8.2 million to nine projects. Today the DoE released more details about the projects it awarded in this round. There are four OLED projects, awarded a total of $3.8 million.

Acuity Brands Chalina lamp photo

Acuity Brands received $455,131 to develop an OLED Luminaire with integrated DC current drivers in each panel and advanced controls. The goal is to demonstrate a luminaire with an efficacy of 65 lm/W and a luminous output of 4,000 lumens.

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.

First-O-Light developed a 111.7 lm/W hybrid OLED device

Nov 02, 2013

First-o-lite logoUpdated: This story had some inaccuracies and is now updated with new information from First-O-Lite

China's First-O-Lite says they developed an efficient (111.7 lm/W at 1,000 cd/m2) hybrid OLED lighting device (2 cm2). This is a hybrid device that uses a fluorescent blue emitter along with red and blue phosphorescent emitters. The company says that this is probably the most efficient hybrid OLED device ever produced that can meet the Energy Star color requirements.

First-O-Lite has established a volume production fab and will soon start producing OLED panels. These will feature over 55 lm/W (at 3,000 cd/m2) and will use the company's external light extraction technology.