Iacopino, D,Lovera, P,O'Riordan, A,Redmond, G

2014

July

Journal of Physical Chemistry A

Highly Polarized Luminescence from beta-Phase-Rich Poly(9,9-dioctylfluorene) Nanofibers

Validated

WOS: 7 ()

LIQUID-CRYSTALLINE POLYFLUORENE CONJUGATED POLYMER NANOWIRES MOBILITY ENHANCEMENT OPTICAL GAIN SOLAR-CELLS ALIGNMENT FILMS MORPHOLOGY EFFICIENCY ANISOTROPY

118

5437

5442

Novel poly(9,9-dioctlylfluorene) (PFO) nanofibers were fabricated by solution template wetting of anodic aluminum oxide (AAO) templates with a pore diameter of 25 nm. Individual nanofibers displayed a pronounced axially polarized luminescence with a typical emission dichroic ratio of 15 and low spread of the emissive species angular distribution. The strong optical characteristics were ascribed to intrachain reorientation of amorphous PFO to a more planar and elongated beta-phase conformation induced by mechanical strain during polymer template pore infiltration. Absorption optical spectroscopy on nanofiber mats confirmed formation of 24% beta-phase emissive segments, which dominated the nanofiber luminescence characteristics. X-ray diffraction measurements were used to confirm and quantify the extent of nanofiber internal molecular alignment.

10.1021/jp505689y