Research / 2021 / Article / Fig 2

Review Article

Multidimensional Information Encryption and Storage: When the Input Is Light

Figure 2

(a) Emission photographs of the excitation-dependent CDs excited from 330 nm to 600 nm. (b) Dual-luminescent pattern of the security ink composed of the coordination compound of europium(III) and fluorescein under blue light and UV light irradiation. (c) Orthogonal emissive properties of the core-shell-shell structured UCNPs. (d) Schematic illustration of inks composed of two kinds of UCNPs showing incomplete and complete information at 808 nm and 980 nm, respectively. (e) Different numbers observed under the excitation wavelength of 980 nm, 800 nm, and 1530 nm. (f) The structure of tip-modified NaYF4@NaTbF4 microrods and their dual-mode information displayed under a 980 nm laser and a 365 nm lamp. (g) The security application of 3D anticounterfeiting barcodes composed of sandwiched nanohybrids. Reproduced with permissions: (a) from [58], Copyright 2015, Wiley-VCH; (b) from [59], Copyright 2018, American Chemical Society; (c) from [63], Copyright 2019, American Chemical Society; (d) from [60], Copyright 2017, The Royal Society of Chemistry; (e) from [27], Copyright 2017, The Royal Society of Chemistry; (f) from [65]. Copyright 2018, The Royal Society of Chemistry; (g) from [66], Copyright 2019, American Chemical Society.

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