23 September 2016 A series of pyrimidine based blue to green thermally activated delayed fluorescent emitters realizing a high EQE of 25%
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Abstract
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.
Conference Presentation
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Hisahiro Sasabe, Hisahiro Sasabe, Ryutaro Komatsu, Ryutaro Komatsu, Kohei Nakao, Kohei Nakao, Yuya Hayasaka, Yuya Hayasaka, Junji Kido, 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 (23 September 2016); doi: 10.1117/12.2235681; https://doi.org/10.1117/12.2235681
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