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.
Idemitsu unveiled the new technology during SID DisplayWeek, and it has received SID's “Distinguished Paper Award”.
Idemitsu Kosan is expanding its OLED production capacity. In December 2020 the company started OLED materials production at its new factory in Chengdu, China.
In 2017 Idemitsu said that it aims to increase its production capacity in 2018 by 70%. In 2018 Idemitsu signed an agreement with Toray to co-develop OLED materials and an agreement with LG Chem to share their OLED material patents. In 2019 Toray and Idemitsu announced that the companies have jointly developed a red TADF OLED device that is the world's most efficient emitter at 46 cd/A.