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Xie, Xiaoji; Gao, Nengyue; Deng, Renren; Sun, Qiang; Xu, Qing-Hua; Liu, Xiaogang
Journal of the American Chemical Society, 08/2013, Letnik: 135, Številka: 34Journal Article
A new type of core–shell upconversion nanoparticles which can be effectively excited at 795 nm has been designed and synthesized through spatially confined doping of neodymium (Nd3+) ions. The use of Nd3+ ions as sensitizers facilitates the energy transfer and photon upconversion of a series of lanthanide activators (Er3+, Tm3+, and Ho3+) at a biocompatible excitation wavelength (795 nm) and also significantly minimizes the overheating problem associated with conventional 980 nm excitation. Importantly, the core–shell design enabled high-concentration doping of Nd3+ (∼20 mol %) in the shell layer and thus markedly enhanced the upconversion emission from the activators, providing highly attractive luminescent biomarkers for bioimaging without autofluorescence and concern of overheating.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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