Science Advances

Supplementary Materials

This PDF file includes:

  • section S1. Calculation of BPEA excitons
  • section S2. Preparation and structural characterization of BPEA nanowires
  • section S3. Formation of EPs in the BPEA nanowires
  • section S4. Structure of the device
  • section S5. Diffusion of the excitons under the applied electric field
  • section S6. Electric effect on the passively waveguided light
  • section S7. Orientation of BPEA excitons in the molecule-stacked nanostructures
  • section S8. Switching speed and switching frequency measurements for the electrically controlled SPDT optical switch
  • section S9. Schematic of the experimental measurements
  • fig. S1. Molecular structure of BPEA.
  • fig. S2. Scanning electron microscopy (SEM) image of the BPEA nanowires.
  • fig. S3. Absorption and fluorescence (solid) spectra of BPEA powder (black) and BPEA nanowires (red).
  • fig. S4. Atomic force microscope (AFM) characterization for a single BPEA nanowire.
  • fig. S5. XRD patterns of the BPEA nanowires (black) and a monoclinic powder sample (red).
  • fig. S6. TEM image of BPEA nanowire and SAED patterns collected from different areas of a single wire.
  • fig. S7. Thermodynamically stable molecular packing in the BPEA nanowire.
  • fig. S8. Formation of EPs in the BPEA nanowires.
  • fig. S9. Output spectra from the two ends of the nanowire in Fig. 1C when the excitation is located in the middle of the wire.
  • fig. S10. SEM image of a typical device.
  • fig. S11. Calculated results of the asymmetric distribution of exciton density.
  • fig. S12. Electric effect on the passively waveguided light.
  • fig. S13. Spatial relationship between the BPEA molecular transition dipole moment (blue arrow) and the 010 growth direction (red arrow) of the BPEA nanowire.
  • fig. S14. Polarization angle–dependent photoluminescence measurements.
  • fig. S15. Switching speed measurements for the optical SPDT switch.
  • fig. S16. Temporal intensity profiles of O1 and O2 ports in the device shown in Fig. 4 obtained by increasing the frequency of the electric signal to ~13 MHz.
  • fig. S17. Schematic demonstration of the experimental setup for the steady-state optical measurement.
  • fig. S18. Schematic demonstration of the response time and switching frequency measurement.
  • References (36–49)

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