二喹喔啉并吩嗪类延迟荧光材料的合成及电致发光性质

doi:10.11896/cldb.24080087

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Abstract Anovel red thermally activated delayed fluorescence (TADF) material, HTPA-TQC, was designed and synthesized by incorporating six triphenylamine (TPA) donor units at 2, 3, 8, 9, 14, and 15 positions of the receptor unit, diquinoxalino[2, 3-a:2′, 3′-c]phenazine (TQC), which possesses a large conjugated plane, strong rigidity, and strong electron-withdrawing properties. Studies show that HTPA-TQC exhibits twisted molecular structure with a dihedral angle of approximately 50°, and the separation and overlap of frontier molecular orbitals are well-ba-lanced. Consequently, it possesses a small singlet-triplet energy gap (ΔE_ST) and a high oscillator strength (f ). Transient spectroscopy reveals that the delayed fluorescence lifetime of HTPA-TQC is 7.85 μs, indicating typical delayed fluorescence characteristics. UV spectroscopy and solvent polarity experiments demonstrate a significant intramolecular charge transfer (ICT) effect in HTPA-TQC. Its photoluminescence emission wavelength reaches 579 nm, with a photoluminescence quantum yield (PLQY) of 65.38%. Devices based on HTPA-TQC successfully achieved red-light emission, with an emission wavelength of 608 nm and a maximum external quantum efficiency (EOE_max) of 0.19%.

Key words： delayed fluorescence diquinoxalino[2,3-a:2′,3′-c]phenazine organic light-emitting diode electroluminescence

Published: 10 January 2026 Online: 2026-01-09

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O621.22

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	TANG Lingjun

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TANG Lingjun. Synthesis and Electroluminescent Properties of Diquinoxalino Phenazine-based Delayed Fluorescence Material[J]. Materials Reports, 2026, 40(1): 24080087-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24080087 OR https://www.mater-rep.com/EN/Y2026/V40/I1/24080087

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