Giant intrinsic circular dichroism of prolinol-derived squaraine thin films

Matthias Schulz, Jennifer Zablocki, Oliya S. Abdullaeva, Stefanie Brück, Frank Balzer, Arne Lützen, Oriol Arteaga and Manuela Schiek ()
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Matthias Schulz: Rheinische-Friedrich-Wilhelms-University of Bonn
Jennifer Zablocki: Rheinische-Friedrich-Wilhelms-University of Bonn
Oliya S. Abdullaeva: Carl-von-Ossietzky-University of Oldenburg
Stefanie Brück: Rheinische-Friedrich-Wilhelms-University of Bonn
Frank Balzer: Mads Clausen Institute, University of Southern Denmark
Arne Lützen: Rheinische-Friedrich-Wilhelms-University of Bonn
Oriol Arteaga: University of Barcelona
Manuela Schiek: Carl-von-Ossietzky-University of Oldenburg

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Molecular chirality and the inherently connected differential absorption of circular polarized light (CD) combined with semiconducting properties offers great potential for chiral opto-electronics. Here we discuss the temperature-controlled assembly of enantiopure prolinol functionalized squaraines with opposite handedness into intrinsically circular dichroic, molecular J-aggregates in spincasted thin films. By Mueller matrix spectroscopy we accurately probe an extraordinary high excitonic circular dichroism, which is not amplified by mesoscopic ordering effects. At maximum, CD values of 1000 mdeg/nm are reached and, after accounting for reflection losses related to the thin film nature, we obtain a film thickness independent dissymmetry factor g = 0.75. The large oscillator strength of the corresponding absorption within the deep-red spectral range translates into a negative real part of the dielectric function in the spectral vicinity of the exciton resonance. Thereby, we provide a new small molecular benchmark material for the development of organic thin film based chiroptics.

Date: 2018
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DOI: 10.1038/s41467-018-04811-7

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