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However, their potential for photoluminescence (PL)\u2010based applications has remained unexplored. Herein, the first successful preparation of Ag\n                    <jats:sub>8<\/jats:sub>\n                    GeS\n                    <jats:sub>6<\/jats:sub>\n                    QDs exhibiting near\u2010infrared (NIR) PL is reported. These Ag\n                    <jats:sub>8<\/jats:sub>\n                    GeS\n                    <jats:sub>6<\/jats:sub>\n                    QDs with an average diameter of 4.2\u20134.6\u00a0nm has an almost constant energy gap at 1.48\u20131.45\u00a0eV, even when the Ge\/(Ag+Ge) precursor ratio is varied from 0.05 to 0.90. A significant PL peak is observed at 920\u00a0nm, the intensity being enlarged with an increase in the Ge\/(Ag+Ge) ratio. The use of Ag\n                    <jats:sub>8<\/jats:sub>\n                    GeS\n                    <jats:sub>6<\/jats:sub>\n                    QDs prepared with Ge\/(Ag+Ge) = 0.82 in the precursors result in a PL quantum yield (QY) of 11%, which is further enhanced to 40% through surface coating with a ZnS shell of 1.0\u00a0nm in thickness, with the PL peak wavelength being slightly blue\u2010shifted to 900\u00a0nm. Following surface modification with 3\u2010mercaptopropionic acid for homogeneous dispersion in aqueous solutions, the Ag\n                    <jats:sub>8<\/jats:sub>\n                    GeS\n                    <jats:sub>6<\/jats:sub>\n                    @ZnS QDs are utilized as an NIR PL probe for in vivo bioimaging. PL signals are clearly detected from depths of at least 15\u00a0mm beneath the back skin of a mouse, demonstrating their deep\u2010tissue imaging capability.\n                  <\/jats:p>","DOI":"10.1002\/smll.202411142","type":"journal-article","created":{"date-parts":[[2025,5,27]],"date-time":"2025-05-27T09:43:57Z","timestamp":1748339037000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Enhancing Near\u2010Infrared Photoluminescence of Ag\n                    <sub>8<\/sub>\n                    GeS\n                    <sub>6<\/sub>\n                    Quantum Dots Through Compositional Fine\u2010Tuning and ZnS Coating for In Vivo Bioimaging"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8649-263X","authenticated-orcid":false,"given":"Nurmanita","family":"Rismaningsih","sequence":"first","affiliation":[{"name":"Graduate School of Engineering Nagoya University  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Chikusa\u2010ku Nagoya 464\u20138603 Japan"},{"name":"Institute for Quantum Life Science National Institutes for Quantum Science and Technology  Anagawa 4\u20109\u20101, Inage\u2010ku Chiba 263\u20138555 Japan"},{"name":"Department of Quantum Life Science Graduate School of Science Chiba University  Chiba 265\u20138522 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoshinobu","family":"Baba","sequence":"additional","affiliation":[{"name":"Graduate School of Engineering Nagoya University  Chikusa\u2010ku Nagoya 464\u20138603 Japan"},{"name":"Research Institute for Quantum and Chemical Innovation Institutes of Innovation for Future Society Nagoya University  Chikusa\u2010ku Nagoya 464\u20138603 Japan"},{"name":"Institute for Quantum Life Science National Institutes for Quantum Science and Technology  Anagawa 4\u20109\u20101, Inage\u2010ku Chiba 263\u20138555 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