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Lanthanide‐based materials exhibit abundant emission colors under suitable infrared excitations; however, the dynamic control of orthogonal photon upconversion of lanthanide ions has remained challenging. Here, a novel mechanistic strategy to enable orthogonal upconversion emissions through energy migration in a simple core–shell nanostructure is reported. By constructing the migratory ytterbium‐sublattice...
In article number 2009796, Bo Zhou and co‐workers propose a novel simple migratory core–shell conceptual model for orthogonal upconversion. The red‐to‐green switchable output is easily achieved by dynamic control of the upconversion by altering the excitation wavelengths (e.g., 980/1530 nm) or using the non‐steady state excitation, showing great promise in the multi‐level information security.
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