Research Center for Organic Electronics ＞【Paper】 A paper written by Ryutaro KOMATSU, a 3rd-year iFront Program student (Kido/Sasabe Lab), has been accepted by J. Mater. Chem. C (IF: 4.696) of Royal Society of Chemistry.

A paper written by Ryutaro KOMATSU, a 3rd-year iFront Program student (Kido/Sasabe Lab), has been accepted by J. Mater. Chem. C (IF: 4.696) of Royal Society of Chemistry.

Light-Blue Thermally Acivated Delayed Fluorescent Emitters Realizing a High External Quantum Efficiency of 25% and Unprecedented Low Drive Voltages in OLEDs
By R. Komatsu, H. Sasabe, Y. Seino, K. Nakao, J. Kido, J. Mater. Chem. C 2015, 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.