https://scholars.lib.ntu.edu.tw/handle/123456789/626368
標題: | Suppressing intermolecular interactions for enhancing the performance of exciplex-based OLEDs | 作者: | Hu Y.-C Chen L.-M Lin Z.-L Lee J.-W Wei W.-C Ko T.-Y Lo C.-Y Hung W.-Y KEN-TSUNG WONG |
關鍵字: | deep-red fluorescence emitter; diphenylphosphine oxide; exciplex; organic light-emitting diode; thermally-activated delayed fluorescence; triazatruxene | 公開日期: | 2022 | 來源出版物: | Journal of the Chinese Chemical Society | 摘要: | In this study, a new triazatruxene-based donor Tr-iBu bearing branched alkyl groups is reported to suppress the aggregation found in a previously reported methyl-substituted counterpart Tr-Me. The effects of a steric factor on the propensity of exciplex formation were examined by respectively mixing these triazatruxene-based donors with PO-T2T and two new acceptors PO-T2P and PO-Pyr, all bearing phosphine oxide as the peripheral groups and N-heteroarene cores with different numbers of nitrogen. Based on the steric hindrance of side groups and their corresponding molecular orbitals alignments of donors and acceptors, the characteristics of exciplex-forming systems were analyzed. Among them, the exciplex-forming blends Tr-iBu:PO-T2P and Tr-iBu:PO-Pyr were selected to serve as the emitting layer (EML) to achieve OLED devices with a moderate maximum external quantum efficiency (EQEmax) of 8.27 and 7.54%, respectively. Adopting the Förster resonance energy transfer strategy, the exciplex cohost was doped with a fluorescence emitter, DPy2CN, to realize a deep-red OLED device with the emission peak centered at 674 nm while retaining EQEmax of 6.28%. Our results highlight the importance of suppressing the donor aggregation, adequate donor: acceptor combination, and a suitable triplet state of composing the materials for giving efficient exciplex-based OLEDs. © 2022 Chemical Society Located in Taipei and Wiley-VCH GmbH. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85129730524&doi=10.1002%2fjccs.202200094&partnerID=40&md5=54bb97209400eb864779c84921332c4f https://scholars.lib.ntu.edu.tw/handle/123456789/626368 |
ISSN: | 00094536 | DOI: | 10.1002/jccs.202200094 |
顯示於: | 化學系 |
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