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Fluorescence Analysis of Local Microenvironments in Polymer Films Using Solvatochromic Dyes.

Tomoharu Matsushita¹, Takuya Tanaka¹, Yuki Sawatari¹

¹Department of Chemical Science and Engineering, Institute of Science Tokyo, Tokyo 152-8552, Japan.

Sensors (Basel, Switzerland)

|February 27, 2026

Summary

Solvatochromic dyes reveal local polymer microenvironments and their impact on fluorescence. This study shows dyes can monitor polymer states and enable fluorescence-based temperature sensing.

Keywords:

fluorescence lifetime (TCSPC)intramolecular charge transfer (ICT)local polarity microheterogeneity polymer films polymer microenvironment ratiometric fluorescence thermometry solvatochromic dye structural relaxation

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Area of Science:

Materials Science
Photophysics
Polymer Chemistry

Background:

Functional polymer films' photophysical behavior is complex, not solely explained by bulk properties.
Understanding local polymer microenvironments is crucial for advanced material applications.

Purpose of the Study:

Investigate how local polymer microenvironments influence fluorescence responses using molecular probes.
Evaluate the potential of solvatochromic dyes for polymer-state monitoring and temperature sensing.

Main Methods:

Employed two solvatochromic dyes (FπPCM and PK) as molecular probes in various polymer matrices.
Prepared polymer films via solution casting and examined photophysical properties (wavelength, quantum yield, lifetime).
Utilized fluorescence lifetime analysis and temperature-dependent measurements on polymer blend films.

Main Results:

Dye fluorescence varied significantly across different polymer matrices, influenced by polarity, chain packing, and dye-polymer interactions.
Microscopic heterogeneity was detected in miscible polymer blend films.
Reproducible temperature sensing was achieved using ratiometric fluorescence analysis in specific blend films.

Conclusions:

Solvatochromic dyes are effective optical probes for characterizing local polymer microenvironments.
These dyes offer potential for real-time polymer-state monitoring and advanced fluorescence-based temperature-sensing applications.