Abstract
Photon Upconversion In article number 2212037, Bo Zhou and co-workers describe a conceptual design to realize the orthogonal upconversion through the selective excitation strategy. The switchable red/green, red/blue, and green/blue together with full-color output are easily achieved at the single nanoparticle level, showing great potential in multi-level anti-counterfeiting, information security and biological applications.
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