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Dinuclear ZnII Complexes Exhibiting Thermally Activated Delayed Fluorescence and Luminescence Polymorphism.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-03-12 , DOI: 10.1002/chem.202000572 Jinfan Xiong 1 , Kai Li 1 , Teng Teng 1 , Xiaoyong Chang 2 , Yaxiong Wei 1 , Chao Wu 1 , Chuluo Yang 1, 3
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-03-12 , DOI: 10.1002/chem.202000572 Jinfan Xiong 1 , Kai Li 1 , Teng Teng 1 , Xiaoyong Chang 2 , Yaxiong Wei 1 , Chao Wu 1 , Chuluo Yang 1, 3
Affiliation
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ZnII complexes exhibiting strong emission in the solid state remain scarce, and most of them exhibit only prompt fluorescence. Herein the synthesis, structures, and photoluminescence properties of two ZnII complexes containing new donor-acceptor ligands is reported. The new ZnII complexes have dinuclear structures in which each metal ion adopts a distorted square-pyramidal geometry. The ZnII complexes show strong emission in the solid state with quantum yields up to 50 %. Variable-temperature transient photoluminescence studies revealed an emission mechanism involving prompt and thermally activated delayed fluorescence (TADF). DFT calculations showed well-separated HOMO and LUMO in the ground state and small excited singlet-triplet energy splitting, accounting for the TADF. The complexes also exhibit different emission colors in the as-synthesized powder state and in single crystals, that is, they exhibit luminescence polymorphism. The single-crystal emission is responsive to mechanical grinding and was characterized by powder XRD.
中文翻译：
双核ZnII配合物表现出热激活的延迟荧光和发光多态性。
固态显示强发射的ZnII复合物仍然稀少，并且大多数仅显示快速荧光。本文报道了两种含有新的供体-受体配体的ZnII配合物的合成，结构和光致发光性能。新的ZnII配合物具有双核结构，其中每个金属离子均采用扭曲的方金字塔形几何形状。ZnII配合物在固态下显示出强发射，量子产率高达50％。可变温度瞬态光致发光研究揭示了一种涉及即时和热激活的延迟荧光（TADF）的发射机制。DFT计算显示，基态的HOMO和LUMO分离良好，激发的单重态-三重态的能量分裂较小，这是TADF的原因。配合物在合成粉末状态和单晶状态下还表现出不同的发射颜色，即它们表现出发光多态性。单晶发射响应于机械研磨并且通过粉末XRD表征。
更新日期：2020-03-12
中文翻译：
双核ZnII配合物表现出热激活的延迟荧光和发光多态性。
固态显示强发射的ZnII复合物仍然稀少，并且大多数仅显示快速荧光。本文报道了两种含有新的供体-受体配体的ZnII配合物的合成，结构和光致发光性能。新的ZnII配合物具有双核结构，其中每个金属离子均采用扭曲的方金字塔形几何形状。ZnII配合物在固态下显示出强发射，量子产率高达50％。可变温度瞬态光致发光研究揭示了一种涉及即时和热激活的延迟荧光（TADF）的发射机制。DFT计算显示，基态的HOMO和LUMO分离良好，激发的单重态-三重态的能量分裂较小，这是TADF的原因。配合物在合成粉末状态和单晶状态下还表现出不同的发射颜色，即它们表现出发光多态性。单晶发射响应于机械研磨并且通过粉末XRD表征。
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