リーディング3年の小松龍太郎君の外部量子効率25%と超低電圧駆動を実現する新規青色熱活性化遅延蛍光発光（TADF）材料に関する論文が英国王立化学会(RSC) の J. Mater. Chem. C (IF: 4.696) にアクセプトされました。小松おめでとう！
By R. Komatsu, H. Sasabe*, Y. Seino, K. Nakao, J. Kido*, J. Mater. Chem. C 2016, accepted.
Abstract: Thermally activated delayed fluorescent (TADF) emitters are one of the most promising candidates for low-cost and high efficiency organic light-emitting devices (OLEDs) to realize an internal quantum efficiency of unity. However, the power efficiency (ηp), which is inversely related to drive voltage, is significantly lower than that of the phosphorescent counterparts, especially for blue devices. Here, we developed a series of TADF emitters, 2-functionalized-4,6-bis[4-(9,9-dimethyl-9,10- dihydroacridine)phenyl]pyrimidine called Ac–RPM. We introduced a phenylacridine moiety into the 4,6-position of pyrimidine core to induce a twisted structure leading to a high photoluminescent quantum yield of ~80%, and a small singlet and triplet excited energy difference of <0.20 eV. The optimized device realized an ηp of 62 lm W−1, a high external quantum efficiency of 25%, light-blue emissions with the Commission Internationale de l’Eclairage chromaticity coordinates of (0.19, 0.37) and a low turn-on voltage of <3.0 V.
