Local spatial distribution of J-aggregates in molecularly oriented bisazo-dye thin films

Area of Science:

• Materials Science
• Optoelectronics
• Physical Chemistry

Background:

• J-aggregates are crucial supramolecular structures in dye molecules with significant optoelectronic potential.
• Understanding their spatial distribution and formation is key to controlling their properties.
• Previous studies lacked detailed spatial analysis of J-aggregate formation in oriented films.

Purpose of the Study:

• To analyze the spatial distribution of partially grown J-aggregates in oriented bisazo-dye films.
• To investigate the formation process and localization of J-aggregates within the film.
• To provide insights for controlling J-aggregate formation for optoelectronic applications.

Main Methods:

• Utilized polarized optical microscopy (POM) for visualizing molecular orientation.
• Employed atomic force microscopy (AFM) for high-resolution surface topography.
• Integrated hyperspectral imaging for local spectral analysis of J-aggregate formation.

Main Results:

• Prepared highly oriented bisazo-dye thin films with a dichroic ratio exceeding 12.
• Revealed that J-aggregates are locally formed and exhibit a distinct spatial distribution from crystalline phases.
• Confirmed local J-aggregate formation through hyperspectral analysis, validating AFM and POM findings.

Conclusions:

• J-aggregate formation is a localized process within oriented bisazo-dye films.
• The spatial distribution of J-aggregates differs from crystalline regions.
• These findings offer critical insights for the precise control and application of J-aggregates in optoelectronics.