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    Induced Aggregation of AIE-Active Mono-Cyclometalated Ir(III) Complex into Supramolecular Branched Wires for Light-Emitting Diodes

    Year: 2017

    Journal: Small, Volume 13, APR 18

    Authors: Maji, Subrata; Alam, Parvej; Kumar, Gundam Sandeep; Biswas, Sandip; Sarkar, Piyush Kanti; Das, Bidisa; Rehman, Ishita; Das, Benu Brata; Jana, Nikhil Ranjan; Laskar, Inamur Rahaman; Acharya, Somobrata

    Organizations: SERB, DST, India [EMR/2014/000664]; DST, India [SB/S1/IC-13/2014]; Wellcome Trust/DBT India alliance [IA/I/13/1/500888]; DST-INSPIRE; CSIR

    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.
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