Mapping the broadband circular dichroism of copolymer films with supramolecular chirality in time and space

• DOI: 10.1038/s41467-021-27886-1
• Publication Date: 2022-01-11T11:02:51Z
• Authors: Marius Morgenroth; Mirko Scholz; Min Ju Cho; Dong Hoon Choi; Kawon Oum; Thomas Lenzer
• Keywords: Polyfluorene; Chirality; Linear dichroism

Abstract Measurements of the electronic circular dichroism (CD) are highly sensitive to absolute configuration and conformation chiral molecules supramolecular assemblies have therefore found widespread application in chemical biological sciences. Here, we demonstrate an approach simultaneously follow changes CD absorption response photoexcited systems over ultraviolet−visible spectral range with 100 fs time resolution. We apply concept polyfluorene copolymer thin films track their relaxation detail. The transient signal stems from system provides information regarding recovery ground state. This allows for a quantification singlet−singlet annihilation charge-pair formation processes. Spatial mapping domains on femtosecond scales resolution 50 μm diffraction-limited steady-state imaging circularly polarised luminescence (CPL) is demonstrated.