UDC Awarded Patent on TADF Material
July 10, 2017 Universal Display, which has a virtual monopoly on phosphorescent material was recently awarded a new patent (USPTO #20170186976) for a TADF OLED emitter and host material based on benzotriazoles. The company said that "phosphorescent materials generally contain a rare metal element such as Ir or Pt. and these metals are rather expensive". TADF, which is being developed by Cynora and Kyulux could also be a viable route towards an efficient blue emitter (blue-emission is specifically mentioned in UDC's new patent). As we have reported previously, Cynora claims that they will have a commercial ready TADF material ready for testing by the end of this year, although the color is currently at 470nm and needs to be at 460nm. UDC says that while their focus is phosphorescent emitters they will patent technology invented by its scientists "even if it is outside our focus, like TADF". The authors of the patent are part of the team that UDC acquired from BASF. The Korean press reported that LG Display is expecting to substitute Cynora’s blue TADF materials for the blue fluorescent material it currently uses in its OLED displays. The article states that the use of such material would improve the power consumption and lifetime of the display, generating an overall performance improvement. The blue TADF material could be used in LGD’s white OLED process, which is then transmitted through a color filter, changing the white light to red, green, and blue sub-pixels. LG, and others, currently use blue fluorescent material from Idemitsu Kosan. TADF materials, which use a group of materials that can ‘activate’ fluorescent materials to behave like phosphorescent ones. Cynora, as the focus of the company’s development effort, has developed a number of blue TADF materials, but lifetime, efficacy and color point are still not up to commercial standards. OLED panel makers in addition to LG are closely watching blue material development and are ready to test even preliminary materials on R&D lines. |
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