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Most of these ketones, however, absorb at ultraviolet wavelengths with low extinction coefficients, limiting the efficiency and scope of accessible photochemical reactions. Herein, we report the use of low\u2010toxicity (Cd, Pb\u2010free) blue ZnSe\u2010based quantum dots (QDs) to sensitize the triplets of their surface\u2010anchored thioxanthone molecules with high triplet energy of 2.75\u00a0eV. Ultrafast spectroscopy unambiguously reveals a stepwise, electron\u2010transfer\u2010mediated triplet energy transfer mechanism. This unusual photosensitization, in conjunction with the unique chemical reactivity of the thioxanthone triplets, allows us to use blue light to drive multiple challenging photochemical and photocatalytic applications: i) visible\u2010to\u2010ultraviolet B photon upconversion with large anti\u2010Stokes shift of 0.8\u00a0eV through triplet\u2010triplet annihilation; ii) energy transfer photocatalysis such as the disulfide\u2010ene reaction; iii) reductive aryl dechlorination and C\u2010N coupling enabled by hydrogen abstraction by thioxanthone triplets. This environmentally benign QD\u2010ketone hybrid system will inspire the design of advanced photocatalysts for a variety of energy\u2010demanding photochemical applications.<\/jats:p>","DOI":"10.1002\/smll.202514174","type":"journal-article","created":{"date-parts":[[2026,2,13]],"date-time":"2026-02-13T12:43:07Z","timestamp":1770986587000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Sensitizing Ketone Triplets Using Low\u2010Toxicity Blue Quantum Dots for Multifunctional Energy\u2010Demanding Applications"],"prefix":"10.1002","volume":"22","author":[{"given":"Zhaolong","family":"Wang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemical Reaction Dynamics and New Cornerstone Science Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences  Dalian 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