Copper Iodide Hybrid with Unique Cu3I3 Trimeric Inorganic Functional Unit and Far-red/Near-infrared Emission

Graphical A neutral copper iodide hybrid with unique Cu 3 I 3 trimeric inorganic functional unit is reported. The hybrid owns a one-dimensional extended polymeric structure in the form of Cu 3 I 3 ( L ) 2 ( L =5,6,7,8-tetrahydroquinoxaline) and has an infrequent far-red/near-infrared emission. The luminescence mechanism is studied to be the combination of metal-to-ligand and halide-to-ligand charge transfer by the results of decay lifetime measurement and calculation of density of states. In this paper, a neutral copper iodide hybrid with unique Cu 3 I 3 trimeric inorganic functional unit is successfully fabricated using 5,6,7,8-tetrahydroquinoxaline ( L ) with large steric-hindrance group as the organic ligand. The hybrid owns a one-dimensional (1D) extended polymeric structure in the form of Cu 3 I 3 ( L ) 2 . As a CuI-based hybrid, 1D-Cu 3 I 3 ( L ) 2 has an infrequent far-red/near-infrared emission, exhibiting the potential application prospects in the field of display and night vision. Moreover, the luminescence mechanism is carefully studied by decay lifetime measurement and calculation of density of states, which is verified to be the combination of metal-to-ligand charge transfer and halide-to-ligand charge transfer.