Optical Readout of Singlet Fission Biexcitons in a Heteroacene with Photoluminescence Detected Magnetic Resonance: Article No. 164702

Gajadhar Joshi, Ryan Dill, Karl Thorley, John Anthony, Obadiah Reid, Justin Johnson

Research output: Contribution to journalArticlepeer-review

5 Scopus Citations

Abstract

Molecular spin systems based on photoexcited triplet pairs formed via singlet fission (SF) are attractive as carriers of quantum information because of their potentially pure and controllable spin polarization, but developing systems that offer optical routes to readout as well as initialization is challenging. Herein, we characterize the electron spin magnetic resonance change in the photoluminescence intensity for a tailored organic molecular crystal while sweeping a microwave drive up to 10 GHz in a broadband loop structure. We observe resonant transitions for both triplet and quintet spin sublevel populations showing their optical sensitivity and revealing the zero-field parameters for each. We map the evolution of these spectra in both microwave frequency and magnetic field, producing a pattern of optically detected magnetic resonance (ODMR) peaks. Fits to these data using a suitable model suggest significant spin polarization in this system with orientation selectivity. Unusual excitation intensity dependence is also observed, which inverts the sign of the ODMR signal for the triplet features, but not for the quintet. These observations demonstrate optical detection of the spin sublevel population dictated by SF and intermolecular geometry, and highlight anisotropic and multi-scale dynamics of triplet pairs.
Original languageAmerican English
Number of pages8
JournalThe Journal of Chemical Physics
Volume157
Issue number16
DOIs
StatePublished - 2022

NREL Publication Number

  • NREL/JA-5900-83446

Keywords

  • crystal
  • magnetic resonance
  • photoluminescence
  • qubit
  • singlet fission

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