研究目的
Investigating the delocalization of excited states in organic semiconductors to understand their efficiency in devices.
研究成果
The study demonstrates the power of TREPR spectroscopy in gaining insight into the electronic structure of excited states in organic semiconductors. Magnetophotoselection experiments reveal the orientation of the dipolar interaction tensor within the molecule, providing crucial information on the extent and mode of delocalization. This approach is applicable even to molecules where more complicated measurements are not viable, offering a deep understanding of the structure?function relationship of semiconducting polymers.
研究不足
The study focuses on building blocks rather than the entire polymer to restrict exciton migration, which may not fully represent the behavior in polymer systems. The symmetry of the excited states of the studied molecules is far from ideal for magnetophotoselection experiments, complicating the assignment of the principal axes of the D tensor.
1：Experimental Design and Method Selection:
Time-resolved electron paramagnetic resonance (TREPR) spectroscopy was used to probe the geometry and extent of excitons in organic semiconductors. Magnetophotoselection experiments were conducted to reveal the mode of exciton delocalization.
2：Sample Selection and Data Sources:
Building blocks of a prototypical conjugated polymer, naphthalene diimide (NDI) and naphthalene diimide bithiophene (NDI-T2), were selected to restrict exciton migration and preserve the geometrical relation between transition dipole moment and the exciton.
3：List of Experimental Equipment and Materials:
TREPR spectroscopy setup with a time resolution of up to 10 ns, pulsed laser excitation at 355 nm.
4：Experimental Procedures and Operational Workflow:
Magnetophotoselection experiments were performed with light polarized either parallel or perpendicular to the external magnetic field. TREPR spectra were recorded in a high-bandwidth direct-detection mode.
5：Data Analysis Methods:
Spectral simulations were used to analyze the TREPR spectra, focusing on the zero-field splitting (ZFS) interaction parameters D and E.
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