Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 142, Issue 9, Pages 4242-4253Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b13772
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Funding
- National Science Foundation [DMR-1507210]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0019902]
- Office of Science, Office of Basic Energy Science, of the U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0012704]
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Inorganic semiconductor materials are best known for their superior physical properties, as well as their structural rigidity and stability. However, the poor solubility and solution-processability of these covalently bonded network structures has long been a serious drawback that limits their use in many important applications. Here, we present a unique and general approach to synthesize robust, solution-processable, and highly luminescent hybrid materials built on periodic and infinite inorganic modules. Structure analysis confirms that all compounds are composed of one-dimensional anionic chains of copper iodide (CumIm+22-) coordinated to cationic organic ligands via Cu-N bonds. The choice of ligands plays an important role in the coordination mode (mu(1)-MC or mu(2)-DC) and Cu-N bond strength. Greatly suppressed nonradiative decay is achieved for the mu(2)-DC structures. Record high quantum yields of 85% (lambda(ex) = 360 nm) and 76% (lambda(ex) = 450 nm) are obtained for an orange-emitting 1D-Cu4I6(L-6). Temperature dependent PL measurements suggest that both phosphorescence and thermally activated delayed fluorescence contribute to the emission of these 1D-A10 compounds, and that the extent of nonradiative decay of the mu(2)-DC structures is much less than that of the mu(1)-DC structures. More significantly, all compounds are remarkably soluble in polar aprotic solvents, distinctly different from previously reported Cul based hybrid materials made of charge-neutral CumXm (X = Cl, Br, I), which are totally insoluble in all common solvents. The greatly enhanced solubility is a result of incorporation of ionic bonds into extended covalent/coordinate network structures, making it possible to fabricate large scale thin films by solution processes.
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