M2 大和田宰君 (Mr. Tsukasa Owada) と笹部久宏准教授の高効率・長寿命りん光有機ELを実現するターピリジン含有クリセン誘導体に関する「A terpyridine-modified chrysene derivative as an electron transporter to improve lifetime in phosphorescent OLEDs」と題する論文が RSC の J. Mater. Chem. C (IF: 6.641) に受理されました！
Title: A terpyridine-modified chrysene derivative as an electron transporter to improve lifetime in phosphorescent OLEDs
By T. Owada, H. Sasabe*, Y. Sukegawa, T. Watanabe, T. Maruyama, Y. Watanabe, D. Yokoyama, J. Kido*, J. Mater. Chem. C 2019, accepted.
Abstract: In this work, we designed and developed a terpyridine-modified chrysene derivative, abbreviated as B3TPyC, to be used as electron-transport layers (ETLs) toward the construction of highly stable phosphorescent OLEDs. A green phosphorescent OLED with a B3TPyC ETL exhibited a low turn-on voltage of 2.4 V at 1 cd m–2 and an external quantum efficiency of 17.5% at 1000 cd m–2 with a long operation lifetime at 50% of the initial luminance (LT50) of over 258 h at current density: 25 mA cm–2 (the initial luminance of approximately 12,000 cd m–2), which corresponds to a LT50 of 19,000 h at 1000 cd m–2. This is more than 1.5 times longer than the time of luminance decay provided by the phenylpyridine counterpart named B3PyPC. These results clearly show the potential and usefulness of terpyridine-based chrysene derivative to be applied in high-performance OLEDs with high operational stability.