Recently, highly emissive neutral copper halide complexes have received much attention. Here, a series of four-coordinate mononuclear Cu(I) halide complexes, [CuX(dpqu)(dpna)] (dpqu = 8-(diphenylphosphino)quinoline, dpna = 1-(diphenylphosphino)naphthalene, X = I (1), Br (2) and Cl (3)), were synthesized, and their molecular structures and photophysical properties were investigated. These complexes exhibit near-saturated red emission in the solid state at room temperature and have peak emission wavelengths at 669–691 nm with microsecond lifetimes (τ = 0.46–1.80 μs). Small S₁–T₁ energy gaps in the solid state indicate that the emission occurs from a thermally activated excited singlet state at ambient temperature. The emission of the complexes 1–3 mainly originates from MLCT transition. The solution-processed devices of complex 1 exhibit stable red emission with a CIE(x, y) of (0.62, 0.38) for a doped device and (0.63, 0.37) for a non-doped device.

中文翻译：

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接近饱和的红色发光体：含有8-（二苯基膦基）喹啉和1-（二苯基膦基）萘配体的四配位卤化铜（i）配合物†

近来，高发射率的中性卤化铜配合物受到了广泛关注。在这里，一系列四坐标的单核卤化铜（I）配合物[CuX（dpqu）（dpna）]（dpqu = 8-（二苯基膦基）喹啉，dpna = 1-（二苯基膦基）萘，X = I（1） ，Br（2）和Cl（3）），被合成，并对其分子结构和光物理性质进行了研究。这些配合物在室温下在固态下表现出接近饱和的红色发射，并且在669–691 nm处具有峰值发射波长，具有微秒的寿命（τ = 0.46-1.80μs）。小S ₁ –T ₁固态的能隙表示发射是在环境温度下由热激活的激发单重态产生的。配合物1-3的发射主要来自MLCT过渡。配合物1的溶液处理的器件表现出稳定的红色发射，对于掺杂的器件，其CIE（x，y）为（0.62，0.38），而对于非掺杂的器件，其为（0.63，0.37）。