Polarized emission from ultra-thin α-sexithiophene layers on oriented β-phase polyfluorene films

Add time:07/14/2019    Source:sciencedirect.com

Oriented films of poly(9,9-dioctylfluorene) (PFO) are produced by the friction transfer technique and exposed to saturated toluene vapor for formation of the metastable β-phase PFO. To obtain white polarized emission, the orange-emitting α-sexithiophene (6T) is deposited on top of these blue-emitting oriented PFO layers. We studied the effects of the thickness of the 6T layer as well as the PFO conformation (β-phase PFO vs. N-phase PFO) on the color and polarization of the emission. Photoluminescence results show that whitening of the emission is possible by depositing a 6T layer as thin as 0.15 nm on PFO. The intensity of the 6T emission region decreases with increasing 6T film thickness from 0.15 to 4.5 nm, but as a general trend the emission is stronger for 6T on β-phase than on N-phase PFO. Very good polarization of both PFO and 6T emitting regions suggests that the 6T molecules are oriented parallel to the orientation of the underlying PFO layer.

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