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Electric-field-induced charge transfer at a heterojunction formed between polymer and polymer .
Electromodulation spectra at and for an ITO/PFB/F8BT/Ca/Al device at . The fractional PL modulation at and was . The inset shows the field dependence of the PL modulation at for ITO/PFB/F8BT/Ca/Al (squares) and ITO/F8BT/PFB/Ca/Al (circles) devices at . The total polymer thickness was for both devices. The incident laser power was .
Room-temperature electromodulation spectra for an ITO/PFB/F8BT/Ca/Al bilayer device at and (squares). The fractional PL modulation at and was . The inset shows the field dependence of the modulation at normalized at the maximum applied field and fitted to an Onsager model as described in the text. The modulation spectrum for an ITO/F8BT device at is shown by the dashed line. The incident laser power was for both devices. The room-temperature PL modulation spectra for an ITO/F8BT/PFB/Ca/Al bilayer device at and are also shown (circles). The dotted line shows the total PL measured from the same device. The incident laser power here was .
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