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Issue 43, 2018
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Designing dual emitting cores for highly efficient thermally activated delayed fluorescent emitters

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Abstract

Improving the efficiency and the stability of TADF-based OLED devices is of vital importance for OLED applications. In this work, two dual emitting cores (2,2′-DPXZ-PN and 3,3′-DPXZ-PN) were rationally synthesized by connecting two identical TADF emitting units and were confirmed with obvious TADF features. The thermal stability accompanied by high Td, Tg and Tm values was obtained via the design of an extension of the molecular structure. Meanwhile, the molar extinction coefficients and PLQYs of the two dual emitting cores 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 values and TADF features, maximum external quantum efficiency (EQE) values of 13.4% for a 2,2′-DPXZ-PN-based OLED device and 14.9% for a 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.

Graphical abstract: Designing dual emitting cores for highly efficient thermally activated delayed fluorescent emitters

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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, 2018,6, 11615-11621
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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, 6, 11615
    DOI: 10.1039/C8TC02849D

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