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In article number 1807900, Xiaogang Liu, Joel K. W. Yang, and co‐workers report tunable‐resonator upconverted emission (TRUE) color printing, which displays a plasmonic color image under white light while revealing a covert upconversion luminescence appearance under near‐infrared laser excitation. A range of luminescent colors and emission enhancement are achieved through incorporating monolayer upconversion...
Lanthanide‐doped nanophosphors are promising in anti‐counterfeiting and security printing applications. These nanophosphors can be incorporated as transparent inks that fluoresce by upconverting near‐infrared illumination into visible light to allow easy verification of documents. However, these inks typically exhibit a single luminescent color, low emission efficiency, and low print resolutions....
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