Spectroscopic Manifestation of Dye Pair Interactions at High Concentrations in structurally organized SiO2 Films

TL;DR

This study investigates how high dye concentrations in mesoporous SiO2 films lead to new spectral features due to the formation of ionic pairs, excimers, and excitons, revealing complex dye interactions.

Contribution

It demonstrates the spectral manifestation of dye interactions at high concentrations in mesoporous silica films, introducing a new understanding of dye aggregation phenomena.

Findings

New spectral bands appear at high dye concentrations.

Formation of ionic pairs, excimers, and excitons explained.

Spectral changes linked to dye aggregation in mesoporous films.

Abstract

Concentration spectral manifestation of the ionic and neutral dyes encapsulated in mesoporous silicate films was studied. The mesoporous dyed SiO2 film was prepared by sol-gel technology with use as surfactant the amphiphilic three-bloc copolymer Pluronic P123. It was discovered when dye concentration exceeds mesoporous one the new spectral bands appear that are distinct from the initial monomolecular predecessors. To explain the phenomena guess is formulated and proved that origin of new spectrums is obliged to formation of the ionic pairs, excimers and excitons with participation of dye molecules localized in the characteristic places of mesoporous silicate film. Key terms: mesoporous silicate film, polymer micelles, dye fluorescence, excimers, ionic pair