TADF, or Thermally Activated Delayed Fluorescence, is a relatively new class of OLED emitter materials that promise efficient and long-lifetime performance without any heavy metals. TADF research started in earnest in 2012, and TADF emitters are expected to become commercial by 2018.

Blue TADF emitter molecules

There are currently three main challenges with OLED emitters that TADF aims to solve - an efficient and long-lasting blue color emitter, low cost alternatives current red and green emitters and the development of soluble OLEDs that can be deposited using low cost ink-jet printing or other "wet" methods.

TADF is being developed by several companies. Japan-based Kyulux was established to commercialize Prof. Adachi's HyperFluoresence TADF technology. Germany-based Cynora is focusing on a blue TADF emitter. Both companies aim to release their first commercial materials in late 2017 or early 2018.

Idemitsu Kosan also considers TADF as one of the key OLED technologies and intends to focus on TADF in the future (although Idemitsu's actual TADF plans are not clear yet). UDC has been recently awarded a patent on TADF materials, although the company says that TADF is not in its focus.

The EU launched two TADF related collaborative research projects to focus on TADF emitters, Project HyperOLED and the 2015 project Phebe.

Latest TADF OLED news

Reports suggest LGD and SDC to participate in Cynora's latest financing round

Jul 26, 2017

ETNews reports that Cynora is finalizing its latest financing round, with aims to raise €15 million. LG Display will participate in the round, investing $9 million, and Samsung Display is also considering a similar sized investment.

Cynora Blue TADF OLED material photo

Cynora, based in Germany, is developing OLED emitters, and has recently announced its blue TADF OLED performance. Cynora's new blue achieves a 15% EQE at 1000 cd/m² with an emission peak at < 470 nm and a LT97 of > 90 hours (at 700 cd/m²) on a device level. Cynora says that it is very confident that it can commercialize its first highly efficient blue emitter by the end of this year, as planned.

Wisechip to commercialize Hyperfluorescence TADF PMOLEDs by year's end

Jul 25, 2017

Hyperfluoresence TADF materials developer Kyulux announced a collaboration with PMOLED maker WiseChip to bring Hyperfluoresence TADF emitter based displays to the market by year's end. Wisechip demonstrated an HF TADF display at the TADF Workshop last week in Fukuoka, Japan.

Wisechip Hyperfluoresence TADF emitters demonstration (TADF Workshop 2017)

The PMOLED display shown by Wisechip was a 0.96" monochrome yellow 128x64 one. The demonstration showed how much brighter (or more efficient) the Hyperfluoresence based display is compared to Wisechip's current fluoresent-based displays. The power saving is almost 50%.

OLED Handbook

OLED-Info at the TADF Workshop in Kyushu University next week

Jul 15, 2017

Next week Kyushu University (in Fukuoka, Japan) will be hosting the 2nd International TADF Workshop. The event aims to share the recent advances and future direction of TADF science and technologies.

The OLED-Info team will attend this exciting workshop. The focus will be on academia oriented lectures, but the event will also include talks from the Dow Chemical Company, Japan Display, BOE Technology Group, Wisechip and TADF developer Kyulux who's sponsoring the event. The workshop will also include a small exhibition and poster sessions.

Researchers from Kyushu University design a new family of TADF emitters based on ESIPT

Jul 11, 2017

Researchers from Kyushu University's Center for Organic Photonics and Electronics Research (OPERA) developed a new TADF emitter molecule that is based on excited-state intramolecular proton transfer (ESIPT).

TADF-ESIPT excitation scheme (Kyushu 2017)

The researcher says that ESIPT can be used to design completely new TADF materials, which could enable researchers to achieve a high performance and long-lasting emitter structure, as a new material family may expand the molecule design possibilities. TADF from a ESIPT molecule has been reported previously - but the researchers say that this is the first demonstration of highly efficient TADF observed inside and outside of a device.

LG aims to adopt a blue TADF emitter in its 2018 OLED TV stack

Jul 06, 2017

Korean news site DDaily posted an interesting article that states that LG Display is looking to replace the fluorescent OLED emitter used in its OLED TVs with a blue TADF emitter.

LG OLEDC7 photo

Following the introduction into LG's OLED TV production process, LG hopes to also use TADF materials in its small and medium OLED production. The report is a bit confusing, but it seems that LGD also aims to use its WOLED display in small and medium display formats - even for VR applications.

Universal Display is developing TADF emitter and host materials

Jul 01, 2017

Universal Display was recently awarded a new patent (USPTO #20170186976) that describes high electroluminescent efficiency TADF OLED emitter and host materials based on benzotriazoles.

UDC emitter and host materials photo

It is very interesting to see UDC developing TADF material. The company is focused on phosphorescent based OLEDs but, as they explain in the patent application, "phosphorescent materials generally contain a rare metal element such as Ir or Pt. These metals are rather expensive and are dependent on limited global resources". TADF could also be a viable route towards an efficient blue emitter (blue-emission is specifically mentioned in UDC's new patent).

Kyulux recruits Kateeva's Dr. Chris Brown as VP of products

Jun 08, 2017

Dr. Chris Brown photoHyperfluoresence TADF materials developer Kyulux announced that Dr. Chris Brown will join the company as VP of Products. Dr. Brown will lead Kyulux's product development and delivery efforts ahead of the company's anticipated first commercial deployments of TADF and Hyperfluorescence materials in the coming year.

Dr. Brown joins Kyulux from OLED inkjet equipment maker Kateeva, where he was Vice President of Process Engineering. Dr. Brown has been granted 31 US patents and has 34 publications.

Nanoco and Kyulux to co-develop hybrid OLED / QLED display technology

May 22, 2017

Hyperfluoresence and TADF OLED emitter developer Kyulux and quantum-dot developer Nanoco announced that the two companies will co-develop a future-generation hybrid OLED / QLED display technology that combines Kyulux's hyperflourescent emitters and Nanoco's heavy metal free quantum dots (CDQDs).

Nanoco CFQD materials photo

Kyulux and Nanoco say that future displays based on this technology will have superior qualities compared to existing displays - high degree of brightness, energy efficiency, color purity and low cost.

Cynora announces its latest blue TADF OLED emitter performance

May 22, 2017

Germany-based blue-TADF OLED emitter developer Cynora announced that it achieved a new performance record with its latest blue emitter material - which the company believes is the best overall performance of a high-efficiency blue emitter ever.

Cynora's new blue achieves a 15% EQE at 1000 cd/m² with an emission peak at < 470 nm and a LT97 of > 90 hours (at 700 cd/m²) on a device level. Cynora says that it is very confident that it can commercialize its first highly efficient blue emitter by the end of this year, as planned.

Meet Kyulux at SID 2017

May 19, 2017

The following is a sponsored message by Kyulux

The SID Display Week, which will take place next week in Los Angeles, California, is one of the most important events in the display industry. This year's Display Week will provide an excellent chance to be updated on the latest advances by Kyulux, the Japan-based OLED TADF and Hyperfluoresence material developer.

Kyulux 2017 TADF demonstration panel

Hyperfluorescence combines TADF and fluorescence to provide the ultimate OLED emission technology, and unlike phosphorescence, it enables full RGB color, 100% IQE and pure narrow spectrum color. Hyperfluorescence is set to replace existing emitter technologies by early 2020, and Kyulux aims to release its first commercial materials by 2018.