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Reviewing the effect of aggregates in Rhodamine 6G aqueous solution on fluorescence quantum efficiency.

U Rocha¹, L E G Armas², W F Silva¹

¹Group of Nano-Photonics and Imaging, Instituto de Física, Universidade Federal de Alagoas, 57072-900 Maceió, AL, Brazil.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy

|May 11, 2024

Summary

Aggregation significantly impacts Rhodamine 6G (R-6G) dye properties. A new model reveals dimer contributions to fluorescence quantum efficiency (η), crucial for understanding energy transfer (ET) at high concentrations.

Keywords:

Aqueous solution of rhodamine 6G Energy transfer Fluorescence quantum efficiency Heat generation Thermal lens

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Area of Science:

Photochemistry
Materials Science
Spectroscopy

Background:

Rhodamine 6G (R-6G) is a highly luminescent dye widely used in various applications.
Dye aggregation can alter optical and thermal properties, impacting performance.
Understanding these changes is crucial for optimizing dye applications.

Purpose of the Study:

To investigate the effect of aggregation on Rhodamine 6G (R-6G) solutions in water.
To analyze thermal diffusivity, refractive index temperature coefficient, fluorescence quantum efficiency, and energy transfer.
To develop a novel model for heat conversion accounting for monomer and dimer contributions.

Main Methods:

Utilized thermal lens (TL) spectroscopy.
Employed conventional absorption and emission spectroscopy.
Applied Förster theory for energy transfer (ET) calculations.

Main Results:

R-6G concentration affects absorption and emission spectra due to dimer formation, influencing fluorescence quantum efficiency (η).
A new model for the fraction of absorbed energy converted into heat (φ) was introduced.
Monomer fluorescence quantum efficiency (ηm) necessitates a significant dimer contribution (ηd = 0.2).
Energy transfer microparameters (CDD, CDA) were calculated, indicating significant monomer-monomer and monomer-dimer ET.

Conclusions:

Dimerization significantly influences R-6G's optical and thermal properties.
The novel heat conversion model accurately captures monomer and dimer effects.
Energy transfer processes are critical for understanding R-6G behavior, especially at high concentrations.
Findings are relevant for R-6G in water and suggest similar studies in other aggregated dye systems.