2026-10-13T16:05:11Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34023765 2026-09-29T12:34:43Z category_1 category_4 category_915 category_7 category_12 category_14 category_873 category_734 portal_63 item_type_6 month_year_09_2026

Spin-Polarized Anthracene Triplet States Sensitized by Si QDs Revealed by Time-Resolved EPR Spectroscopy Mandefro Y. Teferi (10313501) Sanoop Mambully Somasundaran (4738572) Seyedeh Shadi Mirmohammadi (13887717) Ming Lee Tang (1892590) Jens Niklas (805862) Oleg G. Poluektov (1234986) Biophysics Biochemistry Physical Sciences not elsewhere classified Medicine Cell Biology Molecular Biology Chemical Sciences not elsewhere classified Biological Sciences not elsewhere classified solar energy technologies quantum information science could significantly boost based organic molecules spin dynamics monitored si qds revealed electron spin polarization triplet energy transfer si qds spin polarization triplet formation conventional spin well understood two anthracene surprising result resolved continuous photon upconversion magnetic interactions anthracene moiety Photoexcited quantum dot (QD)–chromophore hybrid systems hold great promise for photon upconversion, a process that could significantly boost the efficiency of solar energy technologies and be useful for spintronics and quantum information science. However, the magnetic interactions that govern the generation and transfer of spin polarization in these systems are not well understood. Here, we report the first time-resolved electron paramagnetic resonance (EPR) study of triplet energy transfer (TET) in colloidal Si QDs conjugated with two anthracene-based organic molecules: 9-ethylanthracene and 9-vinylanthracene. Triplet formation and spin dynamics monitored with time-resolved continuous-wave and pulsed EPR spectroscopy reveal Dexter-type TET from Si QDs to the anthracene moiety. Notably, the electron spin polarization of these conjugates displayed unusual fully emissive patterns, a surprising result that cannot be explained by the conventional spin-orbit or radical-pair mechanisms typically seen in purely organic donor–acceptor systems. The mechanism of this novel TET is discussed. 2026-09-29T00:00:00Z Text Journal contribution 10.1021/acs.nanolett.6c03633.s001 https://figshare.com/articles/journal_contribution/Spin-Polarized_Anthracene_Triplet_States_Sensitized_by_Si_QDs_Revealed_by_Time-Resolved_EPR_Spectroscopy/34023765 CC BY-NC 4.0