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具有双吸电子基团D-A型配体的Ag(Ⅰ)发光配合物的合成与性能研究

赵雨晴a,b, 梁栋b, 贾吉慧d, 余荣民*,a,b, 卢灿忠*,b,c   

  1. a福州大学 化学学院 福州 350116;
    b中国科学院福建物质结构研究所 福州 350108;
    c中国科学院大学 福建学院 福州 350108;
    d福建理工大学 材料科学与工程学院 福州 350118
  • 投稿日期:2024-02-21
  • 基金资助:
    国家自然科学基金(No.52073286, No.2021ZZ115, No.2021ZR132)、福建省自然科学基金(No.2021J011073)、福建省区域发展项目(No.2021H4008)以及中国科学院科技服务网络计划(STS2023T3039)资助.

Synthesis and characterization of an emissive Ag(I) complex with a D-A type ligand containing two electron-demanding groups

Zhao Yuqinga,b, Liang Dongb, Jia Jihuid, Yu Rongmin*,a,b, Lu Can-Zhong*,b,c   

  1. aCollege of Chemistry, Fuzhou University, Fuzhou 350116;
    bFujian Institute of Research on the Structure of Matter, Fuzhou 350108;
    cFujian College, University of Chinese Academy of Sciences, Fuzhou 350108;
    dSchool of Materials Science and Engineering, Fujian University of Science and Technology, Fuzhou 350118
  • Received:2024-02-21
  • Contact: *E-mail: rongmingyu@fjirsm.ac.cn, czlu@fjirsm.ac.cn
  • Supported by:
    National Natural Science Foundation of China (No.52073286, No.2021ZZ115, No.2021ZR132), the Natural Science Foundation of Fujian Province (No.2021J011073) and regional development projects in Fujian Province (No.2021H4008), the Science and Technology Service Network Initiative from the Chinese Academy of Science (STS2023T3039).

Thermally activated delayed fluorescence (TADF) materials have attracted significant attention in the field of organic light-emitting diodes (OLEDs) due to their tremendous application potential. The outermost electronic configuration of Ag(I) complex is d10 configuration, with d orbitals always being filled. There is no metal-centered (MC) state, therefore the quenching effect caused by MC state does not occur. This makes it suitable for designing and developing TADF materials. In this study, we designed and synthesized a novel D-A ligand, 9- (4 '- (4,6-diphenyl-1,3,5-triazin-2-yl) -4- (3- (pyridin-2-yl) -1H-pyrazole-1-yl) - [1,1' - biphenyl] -2-yl) -3,6-dimethoxy-9H-carbazole (L). The ligand uses 3,6-dimethoxy-9H-carbazole as the electron donor and contains a bis-electron-donating group composed of triazine and pyridyl pyrazole as the electron acceptor. An ionic Ag(I) complex, Ag(L)(POP)(BF4) (1), was synthesized using L as a nitrogen-containing bidentate ligand and bis [2- (diphenylphosphino) phenyl] ether (POP) as a phosphorus-containing bidentate ligand. The ligand L and complex 1 were characterized by 1H and 13C nuclear magnetic resonance spectrometry, elemental analysis and X-ray single crystal diffraction analysis. The complex 1 belongs to the triclinic crystal system with space group P-1 with a = 13.0213(4) Å, b = 16.3383(4) Å, c = 19.3108(5) Å, α = 92.941(2) °, β = 105.247(3) °, γ = 98.591(2) °, V = 3900.76(18) Å3. The Ag+ ion in complex 1 is tetrahedrally coordinated with a twisted tetrahedral coordination geometry. At room temperature, complex 1 in solid emits strong green light under UV light, with maximum at 490 nm. The fluorescence lifetime is 23.0 ns, the thermally activated delayed fluorescence (TADF) lifetime is 503.9 μs, and the photoluminescence quantum yield (PLQY) is 43.8%. The steady state emission spectra and time-dependent photoluminescent spectra of complex 1 at different temperatures show that complex 1 exhibits TADF characteristics at room temperature.

Key words: Ag(I) complex, crystal structure, photoluminescence, DFT calculation, TADF