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首页> 美国卫生研究院文献>other >Core/Shell NaGdF4:Nd3+/NaGdF4 Nanocrystals with Efficient Near-Infrared to Near-Infrared Downconversion Photoluminescence for Bioimaging Applications
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Core/Shell NaGdF4:Nd3+/NaGdF4 Nanocrystals with Efficient Near-Infrared to Near-Infrared Downconversion Photoluminescence for Bioimaging Applications

机译：核心/壳NAGDF4：ND3 + / NAGDF4纳米晶体具有有效的近红外到近红外下变频光致发光用于生物分析应用

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摘要

We have synthesized core/shell NaGdF4:Nd3+/NaGdF4 nanocrystals with an average size of 15 nm and exceptionally high photoluminescence (PL) quantum yield. When excited at 740 nm, the nanocrystals manifest spectrally distinguished, near infrared to near infrared (NIR-to-NIR) downconversion PL peaked at ~900, ~1050, and ~1300 nm. The absolute quantum yield of NIR-to-NIR PL reached 40% for core-shell nanoparticles dispersed in hexane. Time-resolved PL measurements revealed that this high quantum yield was achieved through suppression of nonradiative recombination originating from surface states and cross relaxations between dopants. NaGdF4:Nd3+/NaGdF4 nanocrystals, synthesized in organic media, were further converted to be water-dispersible by eliminating the capping ligand of oleic acid. NIR-to-NIR PL bioimaging was demonstrated both in vitro and in vivo through visualization of the NIR-to-NIR PL at ~900 nm under incoherent lamp light excitation. The fact that both excitation and the PL of these nanocrystals are in the biological window of optical transparency, combined with their high quantum efficiency, spectral sharpness and photostability, makes these nanocrystals extremely promising as optical biomaging probes.
机译：我们已经合成了核心/壳NAGDF4：Nd 3 + / sup> / nagdf4纳米晶体，其平均尺寸为15nm，光致发光（pl）量子产率特别高。当在740nm处激发时，纳米晶体清单谱分化，近红外线到近红外（内圆形）下变化P1达到〜900，〜1050，〜1300nm。对于分散在己烷中的核 - 壳纳米颗粒，NIR-TO-NIR PL的绝对量子产率达到40％。时间分辨的PL测量显示，通过抑制来自表面状态的非抗体重组和掺杂剂之间的交叉放松来实现这种高量子产率。 nagdf4：Nd 3 + / nagdf4纳米晶体，在有机介质中合成，通过消除油酸的封端配体，进一步转化为可水分散的。通过在一个不相干灯光升激下在〜900nm的〜900nm的〜900nm的可视化上证明了NIR-TO-NIR PL BioMAGACE。既激励和这些纳米晶体的PL都在光学透明度的生物窗口中，与它们的高量子效率，光谱清晰度和光稳定性相结合，使得这些纳米晶体非常有前途是光学生物探头。

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