{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T12:11:07Z","timestamp":1784031067772,"version":"3.55.0"},"reference-count":59,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T00:00:00Z","timestamp":1783987200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T00:00:00Z","timestamp":1783987200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Halide vacancies in CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    nanostructures create deep trap states that limit emission efficiency, particularly in strongly confined blue emitters. Existing passivation strategies often rely on poorly soluble halide sources or bulky ligands that complicate post\u2010synthetic processing. Here, we introduce phosphorus tribromide (PBr\n                    <jats:sub>3<\/jats:sub>\n                    ), a molecular halide source readily soluble in nonpolar media, as a chemically precise surface\u2010engineering agent that simultaneously replenishes bromide vacancies and reconfigures ligand binding. In green\u2010emitting CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    nanocrystals, PBr\n                    <jats:sub>3<\/jats:sub>\n                    converts surface\u2010bound oleic acid into oleoyl bromide, while in situ\u2010generated HBr protonates oleylamine to form electrostatically stabilized OAm\n                    <jats:sup>+<\/jats:sup>\n                    Br\n                    <jats:sup>\u2212<\/jats:sup>\n                    ion pairs. This surface chemical reconfiguration suppresses deep\u2010trap\u2010mediated recombination, increasing the photoluminescence quantum yield (PLQY) from 30% to 74% and preserving high emission efficiency even after ligand\u2010free washing. The optimized interfacial chemistry further renders the nanocrystals sufficiently stable for single\u2010molecule spectroscopy, enabling direct probing of individual emitter dynamics while preserving single\u2010photon characteristics. Extending this soluble halide strategy to strongly quantum\u2010confined 3 monolayer nanoplatelets via controlled direct addition yields efficient defect passivation without spectral shifts, boosting PLQY from 9.4% to 94%. This work establishes a simple and generalizable route for achieving highly efficient green and deep\u2010blue perovskite emitters through controlled surface ionic locking.\n                  <\/jats:p>","DOI":"10.1002\/smll.74542","type":"journal-article","created":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T11:45:09Z","timestamp":1784029509000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Surface Chemical Reconfiguration by PBr\n                    <sub>3<\/sub>\n                    Enables Electrostatic Ligand Locking and High\u2010Efficiency Green and Deep\u2010Blue CsPbBr\n                    <sub>3<\/sub>\n                    Emitters"],"prefix":"10.1002","author":[{"given":"Soumyadeep","family":"De","sequence":"first","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Kanpur Kanpur Uttar Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abhishek","family":"Yogi","sequence":"additional","affiliation":[{"name":"Department of Physics Indian Institute of Technology Kanpur Kanpur Uttar Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ishwar","family":"Gupta","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Kanpur Kanpur Uttar Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nikhil","family":"Shrivas","sequence":"additional","affiliation":[{"name":"Department of Physics Indian Institute of Technology Kanpur Kanpur Uttar Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Venkata Jayasurya","family":"Yallapragada","sequence":"additional","affiliation":[{"name":"Department of Physics Indian Institute of Technology Kanpur Kanpur Uttar Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1205-3006","authenticated-orcid":false,"given":"Vishal","family":"Govind Rao","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Kanpur Kanpur Uttar Pradesh 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