Thermally activated delayed fluorescent (TADF) Cu(I) halide complexes have attracted attention due to their highly emission and short lifetimes (several μs scale). Here, three mononuclear four-coordinate Cu(I) halide complexes containing asymmetric diphosphine and pyridyl phosphine, [CuX(L1)(L2)] (L1 = 2,3-bis(diphenylphoshino)thiophene, L2 = 2-(diphenylphosphino)pyridine, X = I (1), Br(2), Cl (3)), were synthesized and their structures and photophysical properties were characterized. At room temperature, complexes 1–3 in powder exhibit intense green to yellow green delayed fluorescence (λ_em = 497–523 nm, τ = 1.5–4.3 μs, Φ = 0.19–0.28). The emissions of the complexes 1–3 are originated from (metal + halide)-to-ligand and intra-ligand charge transfer. More contributions from MLCT and XLCT can result in the shorter decay lifetimes (1.6 ∼ 4.3 μs), which will prevent a roll-off of efficiency with increasing current density in OLED devices.

热激活延迟荧光 (TADF) Cu(I) 卤化物配合物由于其高发射和短寿命（几 μs 尺度）而引起了人们的关注。这里，三个单核四配位 Cu(I) 卤化物配合物含有不对称二膦和吡啶基膦，[CuX(L1)(L2)]（L1 = 2,3-双(二苯基膦)噻吩，L2 = 2-(二苯基膦)吡啶, X = I ( 1 ), Br( 2 ), Cl ( 3 )), 并对其结构和光物理性质进行了表征。在室温下，粉末中的配合物1 – 3表现出强烈的绿色至黄绿色延迟荧光（λ _em  = 497–523 nm，τ = 1.5–4.3 μs，Φ = 0.19–0.28）。配合物1 – 3的发射源自（金属 + 卤化物）到配体和配体内的电荷转移。MLCT 和 XLCT 的更多贡献可以导致更短的衰减寿命（1.6 ∼ 4.3 μs），这将防止 OLED 器件中电流密度增加时效率下降。