From Event: SPIE Organic Photonics + Electronics, 2016
Here, we developed a series of pyrimidine-based 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 PLQY of ~80%, and a small singlet and triplet excited energy difference of <0.20 eV. The optimized device realized a power efficiency of 62 lm W−1, a high EQEmax of 25%, light-blue emissions with the Commission Internationale de l’Eclairage chromaticity (CIE) coordinates of (0.19, 0.37) and a low turn-on voltage of <3.0 V. Further, we investigated the strucutre–property relationship to unlock the potential of pyrimidine-based emitter. Consequently, we developed a green emitter realizing a power efficiency of over 110 lm W−1 while maintaining extremely low voltages of 2.2 V at 1 cd m−2 and 3.0 V at 1000 cd m−2 at CIE of (0.36, 0.58). Apparently, these performances exceed those of previous TADF devices and are comparable to those of their state-of-the-art phosphorescent devices.
Hisahiro Sasabe, Ryutaro Komatsu, Kohei Nakao, Yuya Hayasaka, and Junji Kido, "A series of pyrimidine based blue to green thermally activated delayed fluorescent emitters realizing a high EQE of 25%," Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 994104 (Presented at SPIE Organic Photonics + Electronics: August 28, 2016; Published: 23 September 2016); https://doi.org/10.1117/12.2235681.
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