Blue-Emissive Upconversion Nanoparticles for Low-Power-Excited Bioimaging in Vivo

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• 作者：Qian Liu ; Tianshe Yang ; Wei Feng ; Fuyou Li
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：March 21, 2012
• 年：2012
• 卷：134
• 期：11
• 页码：5390-5397
• 全文大小：477K
• 年卷期：v.134,no.11(March 21, 2012)
• ISSN：1520-5126

文摘

Water-soluble upconversion luminescent (UCL) nanoparticles based on triplet鈥搕riplet annihilation (TTA) were successfully prepared by coloading sensitizer (octaethylporphyrin Pd complex) and annihilator (9,10-diphenylanthracene) into silica nanoparticles. The upconversion luminescence quantum yield of the nanoparticles can be as high as 4.5% in aqueous solution. As determined by continuous kinetic scan, the nanoparticles have excellent photostability. Such TTA-based upconversion nanoparticles show low cytotoxicity and were successfully used to label living cells with very high signal-to-noise ratio. UCL imaging with the nanoparticles as probe is capable of completely eliminating background fluorescence from either endogenous fluorophores of biological sample or the colabeled fluorescent probe. In particular, such blue-emissive upconversion nanoparticles were successfully applied in lymph node imaging in vivo of living mouse with excellent signal-to-noise ratio (>25), upon low-power density excitation of continuous-wave 532 laser (8.5 mW cm^鈥?). Such high-contrast and low-power excited bioimaging in vivo with a blue-emissive upconversion nanoparticle as probe may extend the arsenal of currently available luminescent bioimaging in vitro and in vivo.