お知らせ《2018年》

【論文掲載】城戸・笹部研究室大学院Ｄ２鎌田さんの高輝度・長寿命TADF有機ELを実現する新規ホール輸送材料に関する論文がChemistry An European Journal（IF:5.317）のInside Coverに選出されました。

2018/02/06

D2 鎌田嵩弘君（Mr. Takahiro Kamata）のの高輝度・長寿命 TADF 有機ELを実現する新規ワイドギャップホール輸送材料に関する「A Novel Sterically Bulky Hole Transporter to Remarkably Improve the Lifetime of Thermally Activated Delayed Fluorescent OLEDs at High Brightness」と題する研究論文が Wiley の Chemistry An European Journal (IF: 5.317) に受理され、インサイドカバーに選出されました。ヘキサフェニルベンゼン骨格の新たなワイドギャップホール輸送材料を用い、緑色 TADF 有機ELデバイスで、1000 cd/m2 の高輝度下、外部量子効率21.6%、電力効率 54.3 lm/W、輝度半減寿命 10,000 時間を実現しています。

Short description: A hexaphenylbenzene derivative hole-transporter significantly enhances the lifetime of organic light-emitting devices (OLEDs) based on thermally activated delayed fluorescence (TADF) at high brightness. A green TADF OLED simultaneouly realizes a high external quantum efficiency of over 20%, a high power efficiency of 54 lm/W, and operation lifetime at 50% of approximately 10,000 hrs at 1000 nit. This result promises a bright future of TADF OLED.

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Title: A Novel Sterically Bulky Hole Transporter to Remarkably Improve the Lifetime of Thermally Activated Delayed Fluorescent OLEDs at High Brightness
By Takahiro Kamata, Hisahiro Sasabe,* Masahiro Igarashi, Junji Kido,* Chem. Eur. J., 2018, in press.

Abstract: For the practical application of organic light emitting devices (OLEDs) based on thermally activated delayed fluorescence (TADF) for large area TV and solid state lighting, low power consumption as well as the operation lifetime at high brightness over 1,000 cd m−2 must be improved. Here, we have developed a novel hexaphenylbenzene-based sterically bulky hole-transport layer named 4DBTHPB with deep ionization potential of 5.8 eV and high triplet energy of 2.7 eV. By using 4DBTHPB, we can realize a highly efficient and stable TADF OLED exhibiting external quantum efficiency of 21.6 % and power efficiency of 54.3 lm W−1 and operation lifetime at 50% (LT50) of approximately 10,000 h at an initial luminance of 1,000 cd m−2. These performances are comparable to those of the state-of-the-art green phosphorescent OLEDs reported in the scientific literatures.

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