Water-dispersible Mn²⁺-doped Ag₂Se QDs were synthesized by solvothermal reaction of silver and manganese salts with selenium source and subsequent ligand exchange. The Mn doping level could be tuned by changing the feed amount of the Mn precursor. The Mn²⁺-doped Ag₂Se QDs had a crystal structure typical of monoclinic α-Ag₂Se. At the Mn doping level of 0.28 %, the photoluminescence quantum yield at 1130 nm remained at 5.7 %. Moreover, EPR spectrum and VSM result suggest paramagnetic characteristics of the 0.28 % doped QDs. Cytotoxicity test indicates good biocompatibility of the Mn²⁺-doped Ag₂Se QDs, which have great potential for biomedical imaging.

通过银和锰盐与硒源的溶剂热反应和随后的配体交换，合成了水分散型Mn ²⁺掺杂的Ag ₂ Se QD。可以通过改变Mn前体的进料量来调节Mn掺杂水平。Mn ²⁺掺杂的Ag ₂ Se QDs具有典型的单斜晶α- Ag ₂ Se晶体结构。在Mn掺杂水平为0.28％时，在1130nm处的光致发光量子产率保持在5.7％。此外，EPR光谱和VSM结果表明0.28％掺杂的QD的顺磁特性。细胞毒性试验表明，掺杂Mn ^2+的Ag ₂具有良好的生物相容性硒量子点，在生物医学成像方面具有巨大的潜力。