城戸・笹部・千葉研究室D3 長村夏生君（Mr. Natsuo Nagamura）と笹部久宏准教授の長寿命リン光有機ELを実現する高堅牢性・高移動度スピロビフルオレン誘導体ホール輸送材料群に関する論文が Wiely の Chem. Eur. J. (IF: 5.020) に受理されました。

本研究は、JSPS 科研費（基盤研究B, 20H02807）、JST センター・オブ・イノベーションプログラム（COI）、JSPS科研費 JP20H05840 (学術変革領域研究「動的エキシトン」)、および、京都大学化学研究所の共同利用・共同研究（#2020-103）の助成を受けたものです。計算には京大化研のスーパーコンピューターシステムを利用しました。

Title: Robust Spirobifluorene Core-based Hole Transporters with High Mobility for Long-Life Green Phosphorescent Organic Light-Emitting Devices
By Natsuo Nagamura, Hisahiro Sasabe*, Hiroki Sato, Nozomi Ito, Shoki Abe, Yoshihito Sukegawa, Daisuke Yokoyama, Hironori Kaji*, Junji Kido*, Chem. Eur. J. 2022, accepted.

Abstract: Using a tailored high triplet energy hole transport layer (HTL) is an efficient way to improve the efficiency and extend the lifetime of organic light-emitting devices (OLEDs), which can use all molecular excitons of singlets and triplets. In this study, dibenzofuran (DBF)-end-capped and spirobifluorene (SBF) core-based HTLs referred as TDBFSBF1 and TDBFSBF2 were effectively developed. TDBFSBF1 exhibited a high glass transition temperature of 178 °C and triplet energy of 2.5 eV. Moreover, a high external quantum efficiency of 22.0%, long operational lifetime at 50% of the initial luminance of 89,000 h, and low driving voltage at 1000 cd m−2 of 2.95 V were achieved in green phosphorescent OLEDs using TDBFSBF1. Further, a high-hole mobility value of 1.9 x 10−3 cm2 V−1s−1 was recorded in TDBFSBF2. A multiscale simulation successfully reproduced the experimental hole mobility values and indicated that the reorganization energy was the primary factor in determining the mobility differences among these SBF core-based HTLs.

城戸・笹部・千葉研究室Webサイト: https://oled.yz.yamagata-u.ac.jp/view.cgi?p=410