TY - JOUR
T1 - Anisotropic Conjugated Polymer Chain Conformation Tailors the Energy Migration in Nanofibers
AU - Camposeo, Andrea
AU - Pensack, Ryan D.
AU - Moffa, Maria
AU - Fasano, Vito
AU - Altamura, Davide
AU - Giannini, Cinzia
AU - Pisignano, Dario
AU - Scholes, Gregory D.
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/11/30
Y1 - 2016/11/30
N2 - Conjugated polymers are complex multichromophore systems, with emission properties strongly dependent on the electronic energy transfer through active subunits. Although the packing of the conjugated chains in the solid state is known to be a key factor to tailor the electronic energy transfer and the resulting optical properties, most of the current solution-based processing methods do not allow for effectively controlling the molecular order, thus making the full unveiling of energy transfer mechanisms very complex. Here we report on conjugated polymer fibers with tailored internal molecular order, leading to a significant enhancement of the emission quantum yield. Steady state and femtosecond time-resolved polarized spectroscopies evidence that excitation is directed toward those chromophores oriented along the fiber axis, on a typical time scale of picoseconds. These aligned and more extended chromophores, resulting from the high stretching rate and electric field applied during the fiber spinning process, lead to improved emission properties. Conjugated polymer fibers are relevant to develop optoelectronic plastic devices with enhanced and anisotropic properties.
AB - Conjugated polymers are complex multichromophore systems, with emission properties strongly dependent on the electronic energy transfer through active subunits. Although the packing of the conjugated chains in the solid state is known to be a key factor to tailor the electronic energy transfer and the resulting optical properties, most of the current solution-based processing methods do not allow for effectively controlling the molecular order, thus making the full unveiling of energy transfer mechanisms very complex. Here we report on conjugated polymer fibers with tailored internal molecular order, leading to a significant enhancement of the emission quantum yield. Steady state and femtosecond time-resolved polarized spectroscopies evidence that excitation is directed toward those chromophores oriented along the fiber axis, on a typical time scale of picoseconds. These aligned and more extended chromophores, resulting from the high stretching rate and electric field applied during the fiber spinning process, lead to improved emission properties. Conjugated polymer fibers are relevant to develop optoelectronic plastic devices with enhanced and anisotropic properties.
UR - http://www.scopus.com/inward/record.url?scp=84999748046&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84999748046&partnerID=8YFLogxK
U2 - 10.1021/jacs.6b10761
DO - 10.1021/jacs.6b10761
M3 - Article
C2 - 27933935
AN - SCOPUS:84999748046
SN - 0002-7863
VL - 138
SP - 15497
EP - 15505
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 47
ER -