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Designing Dual Emitting Cores for Highly Efficient Thermally Activated Delayed Fluorescent Emitters

Abstract

Improving the efficiency and the stability of TADF-based OLED device of vital importance for OLED application. In this work, two dual cores emitters (2,2’-DPXZ-PN and 3,3’-DPXZ-PN) were rationally synthesized by connecting two identical TADF emitting units and confirmed with obvious TADF features. The thermal stability accompanying with high Td, Tg and Tm was obtained via the design of the extension of molecule structure. Meanwhile, the molar extinction coefficient and PLQYs of the two dual cores emitters were also dramatically improved, of which 3,3’-DPXZ-PN in 10 wt% doped CBP film resulted in a PLQY as high as 82%. Based on the high PLQY and TADF features, the maximum external quantum efficiency (EQE) of 13.4% for 2,2’-DPXZ-PN-based OLED device and 14.9% for 3,3’-DPXZ-PN-based OLED device were achieved with a slow efficiency roll-off of 12% and 13.5% at a high luminance of 1000 cd m-2.

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Publication details

The article was received on 11 Jun 2018, accepted on 08 Oct 2018 and first published on 10 Oct 2018


Article type: Paper
DOI: 10.1039/C8TC02849D
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Designing Dual Emitting Cores for Highly Efficient Thermally Activated Delayed Fluorescent Emitters

    D. Wei, F. Ni, Z. Wu, Z. Zhu, Y. Zou, K. Zheng, Z. Chen, D. Ma and C. Yang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC02849D

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