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However, tuning their color with the same component has remained a significant challenge. In this study, we demonstrate that the photochromic color of Cu\u2010doped ZnS nanocrystals (NCs), which is initially pale yellow before light irradiation, can be tuned from gray to brown by adjusting the surface stoichiometry of Zn and S, which is controlled through the use of thiol and non\u2010thiol ligands. Several experiments and quantum chemical calculations using model clusters revealed that the color change is determined by the distribution of Cu, which significantly contributes to the coloration, specifically whether it resides on the Zn\u2010rich or S\u2010rich surface. In contrast, particle size and Cu concentration were found to have little effect on the photochromic color. This study expands the diversity of photochromic responses in inorganic NCs and marks an important step toward the development of further advanced photochromic nanomaterials.<\/jats:p>","DOI":"10.1002\/anie.202423776","type":"journal-article","created":{"date-parts":[[2025,1,27]],"date-time":"2025-01-27T16:34:03Z","timestamp":1737995643000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Photochromic Color Tuning of Copper\u2010Doped Zinc Sulfide Nanocrystals by Control of Local Dopant Environments"],"prefix":"10.1002","volume":"64","author":[{"given":"Mayu","family":"Kimura","sequence":"first","affiliation":[{"name":"Department of Applied Chemistry College of Life Sciences Ritsumeikan University  1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daisuke","family":"Yoshioka","sequence":"additional","affiliation":[{"name":"Department of Applied Chemistry College of Life Sciences Ritsumeikan University  1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1352-2898","authenticated-orcid":false,"given":"I\u2010Ya","family":"Chang","sequence":"additional","affiliation":[{"name":"Department of Applied Chemistry College of Life Sciences Ritsumeikan University  1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akinori","family":"Irizawa","sequence":"additional","affiliation":[{"name":"Synchrotron Radiation Center Ritsumeikan University  1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daisuke","family":"Shibata","sequence":"additional","affiliation":[{"name":"Synchrotron Radiation Center Ritsumeikan University  1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shin","family":"Imada","sequence":"additional","affiliation":[{"name":"Department of Physical Sciences College of Science and Engineering Ritsumeikan University  1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3339-3755","authenticated-orcid":false,"given":"Yoichi","family":"Kobayashi","sequence":"additional","affiliation":[{"name":"Department of Applied Chemistry College of Life Sciences Ritsumeikan University  1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,2,5]]},"reference":[{"key":"e_1_2_8_1_1","unstructured":"J. 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