Quantum dots (QDs) with fluorescence in the second near-infrared window (NIR-II, 1000–1400 nm) are ideal fluorophores for in vivo imaging of deep tissue with high signal-to-noise ratios. Ag₂Se (bulk band gap 0.15 eV) is a promising candidate for preparing NIR-II QDs. By using 1-octanethiol as ligand to effectively balance the nucleation and growth, tuning the fluorescence of Ag₂Se QDs was successfully realized in the NIR-II window ranged from 1080 to 1330 nm. The prepared Ag₂Se QDs can be conveniently transferred to the aqueous phase by ligand exchange, showing great potential for multicolor NIR-II fluorescence imaging in vivo.

中文翻译：

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在第二个近红外窗口中具有可调发射的Ag ₂ Se量子点

在第二个近红外窗口（NIR-II，1000-1400 nm）中具有荧光的量子点（QD）是用于高信噪比的深层组织体内成像的理想荧光团。Ag ₂ Se（带隙为0.15 eV）是制备NIR-II QD的有前途的候选物。通过使用1-辛硫醇作为配体有效地平衡成核和生长，在范围为1080至1330 nm的NIR-II窗口中成功实现了Ag ₂ Se QDs荧光的调节。制备的Ag ₂ Se量子点可通过配体交换方便地转移到水相中，显示出在体内进行多色NIR-II荧光成像的巨大潜力。