期刊
CHEMISTRY OF MATERIALS
卷 33, 期 13, 页码 5317-5325出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c01421
关键词
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资金
- Materials Sciences and Engineering Division, Office of Basic Research Energy Sciences of the U.S. Department of Energy [DE-SC0019902]
- Office of Science, Office of Basic Energy Science, of the U.S. Department of Energy [DE-AC0205CH11231]
A group of copper iodide-based hybrid semiconductors with tunable photoluminescence and high charge carrier mobility has been synthesized and characterized, showing promising potential as a new type of emissive layer for LED devices.
A group of copper iodide-based hybrid semiconductors with the general formula of 2D-CuI(L)(0.5) (L = organic ligands) are synthesized and structurally characterized. All compounds are two-dimensional (2D) networks made of one-dimensional (1D) copper iodide staircase chains that are interconnected by bidentate nitrogen-containing ligands. Results from optical absorption and emission experiments and density functional theory (DFT) calculations reveal that their photoluminescence (PL) can be systematically tuned by adjusting the lowest unoccupied molecular orbital (LUMO) energies of the organic ligands. Charge carrier transport measurements were carried out for the first time on single crystals of selected 2D-CuI(L) 0.5 structures, and the results show that they possess ptype conductivity with a Hall mobility of similar to 1 cm(2) V-1 s(-1) for 2D-CuI(pm)(0.5) and 0.13 cm(2) V-1 s(-1) for 2D-CuI(pz)(0.5), respectively. These values are comparable to or higher than the mobilities of typical highly luminescent organic semiconductors. This work suggests that robust, high-dimensional copper iodide hybrid semiconductors are promising candidates to be considered as a new type of emissive layer for light-emitting diode (LED) devices.
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