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Jie Shen, Guanying Chen, Anne-Marie Vu, Wei Fan, Osman S. Bilsel, Chun-Chih Chang and Gang Han Engineering the Upconversion Nanoparticle Excitation Wavelength: Cascade Sensitization of Tri-doped Upconversion Colloidal Nanoparticles at 800 nm Advanced Optical Materials 1

Article first published online: 1 JUL 2013 | DOI: 10.1002/adom.201300160

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Cascade-sensitized 800 nm excited tri-doped upconversion nanoparticles (UCNPs) are developed for the first time. This novel class of UCNPs employ Nd3+ as an 800 nm photon sensitizer and Yb3+ as a bridging ion, and show strong upconversion emission without photobleaching. They outperform classical 980 nm excited UCNPs in regard to significantly decreased NIR photon absorption in water and decreased laser-induced water heating effects.

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