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Proceedings Paper

A series of pyrimidine based blue to green thermally activated delayed fluorescent emitters realizing a high EQE of 25%
Author(s): Hisahiro Sasabe; Ryutaro Komatsu; Kohei Nakao; Yuya Hayasaka; Junji Kido
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Paper 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.

Paper Details

Date Published: 23 September 2016
PDF: 5 pages
Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 994104 (23 September 2016); doi: 10.1117/12.2235681
Show Author Affiliations
Hisahiro Sasabe, Yamagata Univ. (Japan)
Ryutaro Komatsu, Yamagata Univ. (Japan)
Kohei Nakao, Yamagata Univ. (Japan)
Yuya Hayasaka, Yamagata Univ. (Japan)
Junji Kido, Yamagata Univ. (Japan)

Published in SPIE Proceedings Vol. 9941:
Organic Light Emitting Materials and Devices XX
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

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