Nano Letters· 2026Q1
Spin-Polarized Anthracene Triplet States Sensitized by Si QDs Revealed by Time-Resolved EPR Spectroscopy
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- Q1SCImago
- 2026year
Short summary
Time-resolved EPR spectroscopy reveals Dexter-type triplet energy transfer from Si QDs to anthracene, generating unusual fully emissive spin polarization patterns not explained by conventional mechanisms.
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Key points
- First time-resolved EPR study of triplet energy transfer (TET) in Si QD-anthracene conjugates.
- Demonstrated Dexter-type TET from Si QDs to the anthracene moiety.
- Observed unusual fully emissive electron spin polarization patterns.
- The observed spin polarization cannot be explained by conventional spin-orbit or radical-pair mechanisms.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract 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.
The authors' abstract, as published at the source. Nano Letters, 2026 · DOI ↗
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Field: Physical and Theoretical Chemistry
Physical and Theoretical ChemistryChemistry