Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 125, Issue 27, Pages 7447-7455Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.1c02750
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Funding
- Science and Engineering Research Board, Government of India [SERB -SRG/2019/001410]
- National Institute of Technology Tiruchirappalli
- DST
- Department of Science and Technology (DST - INSPIRE Research Grant), Government of India
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This study demonstrates the control of tubular pseudoisocyanine (PIC) dye J- and H-aggregate formation using lithocholic acid (LCA) as a template, resulting in tunable exciton fluorescence. By adjusting the LCA/PIC molar ratio, the optical properties of the dye aggregates can be switched, providing important guidelines for the design of organic photo-functional materials.
Strongly coupled dye aggregates with tailored exciton properties may find their use in developing artificial light-harvesting and optoelectronic devices. Here, we report the control of tubular pseudoisocyanine (PIC) dye J- and H-aggregate formation with tunable exciton fluorescence using lithocholic acid (LCA) as a template. The LCA-templated PIC J-aggregate nanotubes formed at a higher LCA/PIC molar ratio (>= 5:1) exhibit a sharp, red-shifted absorption band (at 555 nm), intense fluorescence (at 565 nm), and shorter lifetime (200 ps), all indicating their strong superradiance properties. In contrast, the H-aggregate nanotubes formed at a lower LCA/PIC molar ratio (2:1) exhibit a significantly blue-shifted absorption band (at 420 nm) and highly red-shifted fluorescence emission (at 600 nm) with enhanced lifetime (4.40 ns). The controlled switching of the optical properties of the PIC dye aggregates achieved by controlling the LCA/PIC molar ratio could serve as an important guideline for the design of organic photo-functional materials.
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