Fig. 5: HFI of BAI-based polymers at room temperature.
From: Halogenated-edge polymeric semiconductor for efficient spin transport
a Schematic diagram of stimulated echo sequence of 3P-ESEEM70. Electron coherence is generated by π/2-T-π/2 pulse sequence (Polarization generator). After time T, electron and nuclear spins are mixed, and the spin echo signal is modulated periodically (Mixing time). Finally, the π/2-T-π/2 pulse sequence is applied to read out the signal (Read out). b Echo signals of H2PC, PDPP-TT, PBAI-V, P2ClBAI-V and PFClBAI-V with mixing time T, respectively. The blue curve represents the echo signal of H2PC and PDPP-TT, and the yellow curve represents the echo signal of BAI-based polymers. c Frequency ___domain spectrum of echo signal after Fourier transform. d The energy level diagram with an S = 1/2, I = 1 spin system under the condition of exact cancellation (|A/2 | = |νI | ). (EZ electron Zeeman interaction, HFI hyperfine interaction, NZ nuclear Zeeman interaction, NQI nuclear quadrupole interaction, SQ single quantum, and DQ double quantum). e Schematic representation of the spin-relaxation interaction, in which the azure sphere represents the spin-polarized charge carriers, the yellow and blue sphere represents the nuclear spins of the 14N and 1H atoms, and the μN is the nuclear magnetic moment from the nuclear spins of the 14N and 1H atoms.
