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Colloidal quantum dots (QDs) are widely utilized in optoelectronic applications, but their radiation stability at the device level remains largely unexplored. Here, we investigate the origin of proton\u2010induced degradation in CdSe\/ZnS quantum dots light\u2010emitting diodes (QLEDs) with fluences from 10\n                    <jats:sup>13<\/jats:sup>\n                    to 10\n                    <jats:sup>15<\/jats:sup>\n                    p\/cm\n                    <jats:sup>2<\/jats:sup>\n                    . While negligible degradation or slight improvement in diode behavior are observed at low fluence, severe deterioration occurs above 10\n                    <jats:sup>14<\/jats:sup>\n                    p\/cm\n                    <jats:sup>2<\/jats:sup>\n                    , leading to complete luminance loss at 10\n                    <jats:sup>15<\/jats:sup>\n                    p\/cm\n                    <jats:sup>2<\/jats:sup>\n                    . Electrical analysis reveals a substantial increase in trap density, particularly at the QD\/ZnO interface. Depth\u2010resolved ToF\u2010SIMS and XPS results indicate that proton irradiation induces detachment of organic ligands such as oleic acid and trioctylphosphine from the ZnS shell. The ligand\u2010depleted ZnS surface is likely to couple electronically with defect\u2010associated states at the ZnO surface through local charge redistribution, generating high\u2010density interfacial trapping states that hinder charge injection into the emissive QD layer. This interfacial degradation accelerates non\u2010radiative recombination and device failure, highlighting the critical need for robust ligand passivation strategies for space applications.\n                  <\/jats:p>","DOI":"10.1002\/smll.76049","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T05:47:58Z","timestamp":1790747278000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Unraveling the Proton\u2010Induced Degradation Mechanism in Quantum\u2010Dots Light\u2010Emitting Diode for Space Applications"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-6746-8603","authenticated-orcid":false,"given":"Chanwoo","family":"Lim","sequence":"first","affiliation":[{"name":"Advanced Photovoltaics Research Center Korea Institute of Science and Technology (KIST)  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-9758-3018","authenticated-orcid":false,"given":"Tai","family":"Nguyen","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Oklahoma State University  Tulsa OK USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-0611-0135","authenticated-orcid":false,"given":"Chanmin","family":"Kim","sequence":"additional","affiliation":[{"name":"Advanced Photovoltaics Research Center Korea Institute of Science and Technology (KIST)  Seoul Republic of Korea"},{"name":"Department of Materials Science and Engineering Korea University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1093-876X","authenticated-orcid":false,"given":"Darshpreet Kaur","family":"Saini","sequence":"additional","affiliation":[{"name":"Department of Physics University of North Texas  Denton Texas USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0704-9264","authenticated-orcid":false,"given":"Todd A.","family":"Byers","sequence":"additional","affiliation":[{"name":"Department of Physics University of North Texas  Denton Texas USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-2288-1729","authenticated-orcid":false,"given":"Youngjo","family":"Choi","sequence":"additional","affiliation":[{"name":"Advanced Photovoltaics Research Center Korea Institute of Science and Technology (KIST)  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7748-1469","authenticated-orcid":false,"given":"Bibhudutta","family":"Rout","sequence":"additional","affiliation":[{"name":"Department of Physics University of North Texas  Denton Texas USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-9849-2044","authenticated-orcid":false,"given":"Dong Hyun","family":"Kim","sequence":"additional","affiliation":[{"name":"School of Civil Environmental and Architectural Engineering Korea University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1143-5822","authenticated-orcid":false,"given":"Jun Hong","family":"Noh","sequence":"additional","affiliation":[{"name":"School of Civil Environmental and Architectural Engineering Korea University  Seoul Republic of Korea"},{"name":"Department of Integrative Energy Engineering Korea University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1434-8844","authenticated-orcid":false,"given":"Soong Ju","family":"Oh","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Korea University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0408-9498","authenticated-orcid":false,"given":"Taeyeon","family":"Kim","sequence":"additional","affiliation":[{"name":"Advanced Photovoltaics Research Center Korea Institute of Science and Technology (KIST)  Seoul Republic of Korea"},{"name":"Department of Chemistry Sungkyunkwan University (SKKU)  Suwon Republic of Korea"},{"name":"KIST\u2010SKKU Carbon\u2010Neutral Research Center SKKU  Suwon Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jae\u2010Hyeon","family":"Ahn","sequence":"additional","affiliation":[{"name":"Advanced Photovoltaics Research Center Korea Institute of Science and Technology (KIST)  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9647-3387","authenticated-orcid":false,"given":"Do 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