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Upconversion nanoparticles (UCNPs) doped with lanthanide ions that possess ladder‐like energy levels can give out multiple emissions at specific ultra‐violet or visible wavelengths irrespective of excitation light. However, precisely controlling energy migration processes between different energy levels of the same lanthanide ion to generate switchable emissions remains elusive. Herein, a novel dumbbell‐shaped...
In article number 1906225, Qingsong Mei, Yong Zhang, and co‐workers navigate energy migration of lanthanide activator ions in a novel dumbbell‐shaped upconversion nanoparticle along favored transition pathways at specific excitation wavelengths, resulting in orthogonal emission properties. Such specially designed nanoparticles are further explored for simultaneous imaging of latent fingerprints and...
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