Sol–gel synthesis, spectral properties and stability of silica films doped by fluorescent dyes

Abstract

Silicon dioxide thin films with organic fluorescent dyes with different amount of matrix layers were prepared by sol-gel spin coating and dripping technique, synthetic and subsequent treatment parameters were proposed for obtaining materials with high homogeneity and dye stability. The structural, morphological and optical properties of obtained materials have been studied by X-ray diffraction, atomic force microscopy and ultraviolet-visible spectroscopy. Immobilisation of the dye increases the degree of film amorphousness. Immobilisation greatly affects the spectral properties of coumarin 6 and BODIPY due to the dye protonation by acid catalyst, this effect is reversible in case of coumarin 6. Rhodamine 6G spectral characteristics are not influenced by immobilisation. In the hybrid materials monomeric form of the dyes retained at higher concentration compared with solutions. Dye immobilisation was found to increase dyes photostability.

On the Use of Polymer-Based Composites for the Creation of Optical Sensors: A Review

“…Ethyl cellulose matrices with BODIPY or bis-dipyrrin complexes can be used for the some gases detection in micro quantities in air [ 48 , 49 , 63 ]. It should also be noted that sorption increases the threshold for aggregation, i.e., more dye can be placed in the matrix without forming aggregates [ 64 ].…”

Photoinduced and Classical Sol-Gel Synthesis: Spectral and Photophysical Behavior of Silica Matrix Doped by Novel Fluorescent Dye Based on Boron Difluoride Complex

“…Different families of organic dyes such as coumarin, rhodamine 6G, and BODIPY have been active components in hybrid materials and have a good response as dye lasers [ 13 ]. In recent years, research has continued to develop pirromethene-BF2 complexes (BODIPY) [ 14 ].…”