Journal
INORGANIC CHEMISTRY
Volume 61, Issue 1, Pages 399-405Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c03021
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Funding
- National Natural Science Foundation of China [62104062, 21671058, 61874039, 51802079, 81902158]
- Innovation Research Team of Science and Technology in Henan province [20IRTSTHN020]
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Researchers have developed a simple method for synthesizing blue-emissive and yellow-emissive copper halide perovskite derivatives, which are lead-free and exhibit excellent photoelectric properties. Triggered by ethanol or CsI, a reversible chemical transformation occurs between these derivatives, which can be used for anti-counterfeiting purposes.
Lead halide perovskites have promising values in photoelectronic and photovoltaic applications, but the toxicity of lead is a hard barrier. Copper halide perovskite derivatives (CHPDs), as a lead-free substitution of lead halide perovskites, also exhibit excellent photoelectric properties. Here, we present a facile one-step route for the synthesis of blue-emissive Cs3Cu2I5 (emission at 440 nm) and yellow-emissive CsCu2I3 (emission at 552 nm) CHPDs in ethanol at room temperature. Triggered by ethanol or CsI, a reversible chemical transformation accompanied by emissive color change between Cs3Cu2I5 and CsCu2I3 CHPDs was achieved. The reversible transformation mechanism was discussed, and this transformation was employed for effective anticounterfeiting.
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