化学
光子上转换
纳米颗粒
芯(光纤)
壳体(结构)
光子
放射化学
纳米技术
离子
光学
有机化学
物理
材料科学
复合材料
作者
Xiaoji Xie,Nong Gao,Renren Deng,Qiang Sun,Qing‐Hua Xu,Xiaogang Liu
摘要
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 (Nd(3+)) ions. The use of Nd(3+) ions as sensitizers facilitates the energy transfer and photon upconversion of a series of lanthanide activators (Er(3+), Tm(3+), and Ho(3+)) 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 Nd(3+) (~0 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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