Ultrafast energy transfer in blended polyphenothiazine/polyphenylene vinylene film

Two-polymers, phenothiazine derivatives (PQ) and poly 2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene (MEH-PPV), who show complementary absorption to the solar spectrum are blended for broader absorption. The energy transfer from PQ to MEH-PPV is designed and observed at ultrafast time scale of ∼2 ps. Föster resonance energy transfer (FRET) process is regarded as the mechanism. Band gap of PQ is determined as 2.5 eV. With this design, a ladder type energy transfer and collection is suggested.