Centre for Advanced Materials (CAM), Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700032, India.
Department of Chemistry, Birla Institute of Technology and Science (BITS), Pilani, Rajasthan, 333031, India.
Small. 2017 Apr;13(15). doi: 10.1002/smll.201603780. Epub 2017 Jan 30.
Aggregation-induced emission (AIE) is commonly observed in irregular bulk form. Herein, unique aggregation properties of an AIE-active complex into branched supramolecular wires are reported for the first time. Mono-cyclometalated Ir(III) complex shows in-plane J-aggregation at the air-water interface owing to the restriction of intramolecular vibration of bidentate phenylpyridinato and intramolecular rotations of monodentate triphenylphosphine ligands at air-water interface. As a consequence, a large enhancement of luminescence comparable to the solid state is obtained from the monolayers of supramolecular wires. This unique feature is utilized for the fabrication of light-emitting diodes with low threshold voltage using supramolecular wires as active layer. This study opens up the need of ordered assembly of AIE complexes to achieve optimal luminescence characteristics.
聚集诱导发光（AIE）通常在不规则块状形式中观察到。在此，首次报道了 AIE 活性配合物独特的聚集性质，形成支化超分子线。由于在空气-水界面处双齿苯并吡啶和单齿三苯基膦配体的分子内振动的限制，单环金属化 Ir(III) 配合物表现出面内 J-聚集。结果，从超分子线的单层中获得了与固态相当的大的发光增强。这种独特的特性被用于制造使用超分子线作为有源层的具有低阈值电压的发光二极管。这项研究开启了有序组装 AIE 配合物以实现最佳发光特性的需求。
