4.7 Article

Highly Stable Tetrahydrothiophene 1-Oxide Caged Copper Bromide and Chloride Clusters with Deep-Red to Near-IR Emission

Journal

INORGANIC CHEMISTRY
Volume 61, Issue 28, Pages 10950-10956

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.2c01542

Keywords

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Funding

  1. Hong Kong University of Science and Technology (HKUST)
  2. Department of Chemistry [IRS21SC07]
  3. Research Grants Council via GRF Project [16306020]
  4. CRF Grant [C7035-20G]

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Researchers have reported a series of lead-free hybrid organic-inorganic copper halides with tunable structures and emission spectra, exhibiting excellent optical properties and high photoluminescence quantum yield.
All-inorganic copper(I)-based metal halides have emerged as promising candidates for the replacement of lead perovskites because of their outstanding optical properties. However, the limited structure tunability prohibits their further exploration of properties including red photoluminescence (PL). Here, we report a series of red-emissive lead-free hybrid organic-inorganic copper halides A6(C4H8OS)(12)[Cu8X13][Cu4X4(OH)(H2O)] (ACX-THTO, A = K, Rb, and Cs; X = Cl, Br; THTO = C4H8OS) with the highest photoluminescence quantum yield (PLQY) of 42%. These compounds possess similar crystal structures, and their emission can be tuned in the spectral range of 676-732 nm by controlling their compositions. Additionally, by removing and adding THTO, the reversible transformation between CsCu2Br3 featuring one-dimensional (1D) chains and Cs-6(C4H8OS)(12)[Cu8Br13][Cu4Br4(OH)(H2O)] (CCB-THTO) with zero-dimensional (0D) clusters can be realized. We also demonstrate that the incorporation of THTO in the crystal structures instead of dimethyl sulfoxide (DMSO) can significantly enhance the stability and PL of compounds with the same inorganic components.

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