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Natural optical activity as the origin of the large chiroptical properties in π-conjugated polymer thin films
DOI:
10.1038/s41467-020-19951-y
Authors:
Jessica
Wade
(Imperial College London)
,
James N.
Hilfiker
(J.A. Woollam Co. Inc)
,
Jochen R.
Brandt
(Imperial College London)
,
Letizia
Liirò-peluso
(University of Nottingham)
,
Li
Wan
(Imperial College London)
,
Xingyuan
Shi
(Imperial College London)
,
Francesco
Salerno
(Imperial College London)
,
Seán T. J.
Ryan
(Imperial College London)
,
Stefan
Schöche
(J.A. Woollam Co. Inc)
,
Oriol
Arteaga
(Universitat de Barcelona)
,
Tamas
Javorfi
(Diamond Light Source)
,
Giuliano
Siligardi
(Diamond Light Source)
,
Cheng
Wang
(Advanced Light Source)
,
David B.
Amabilino
(University of Nottingham)
,
Peter H.
Beton
(University of Nottingham)
,
Alasdair J.
Campbell
(Imperial College London)
,
Matthew J.
Fuchter
(Imperial College London)
Co-authored by industrial partner:
Yes
Type:
Journal Paper
Journal:
Nature Communications
, VOL 11
State:
Published (Approved)
Published:
December 2020
Diamond Proposal Number(s):
20376
,
21822

Abstract: Polymer thin films that emit and absorb circularly polarised light have been demonstrated with the promise of achieving important technological advances; from efficient, high-performance displays, to 3D imaging and all-organic spintronic devices. However, the origin of the large chiroptical effects in such films has, until now, remained elusive. We investigate the emergence of such phenomena in achiral polymers blended with a chiral small-molecule additive (1-aza[6]helicene) and intrinsically chiral-sidechain polymers using a combination of spectroscopic methods and structural probes. We show that – under conditions relevant for device fabrication – the large chiroptical effects are caused by magneto-electric coupling (natural optical activity), not structural chirality as previously assumed, and may occur because of local order in a cylinder blue phase-type organisation. This disruptive mechanistic insight into chiral polymer thin films will offer new approaches towards chiroptical materials development after almost three decades of research in this area.
Journal Keywords: Circular dichroism; Electronic devices; Optical physics; Polymers
Subject Areas:
Materials,
Physics
Instruments:
B23-Circular Dichroism
Documents:
s41467-020-19951-y.pdf