Anticounterfeiting Application of 2D Nanosheets Decorated with Copper Halide Nanocrystals
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초록
내용
Cs3Cu2I5 nanocrystals (CuNCs), a promising copper halide substitute for perovskite, have been successfully synthesized on 2D nanosheets. CuNCs-decorated 2D nanosheets (CuMNHs) are produced for the first time by growing CuNCs concurrently with the formation of copper-based seeds on the surface of 2D nanosheets. Increasing the amount of 2D nanosheets decreases photoluminescence intensity, indicating that the 2D nanosheets facilitate the nonradiative transfer of energy from CuNCs to CuMNHs. Under high-energy ultraviolet light, CuMNHs emit stable solid-state luminescence with a large Stokes shift, indicating no self-absorption. Using the ability of CuMNHs to emit photoluminescence with a large Stokes shift in response to a specific excitation, a new anti-counterfeiting strategy is devised with selectively luminescent pixels under illumination. This research was fabricated a luminescent quick-response code with false pixels using CuMNHs as a novel anti-counterfeiting method.