Self‐Assembly of Ultrabright Fluorescent Silica Particles

Abstract

Light shines through: A one‐step self‐assembly synthesis of mesoporous silica particles with encapsulated organic dyes (see image) is described. The dyes are physically encapsulated inside nanosize channels/tubes in micrometer‐size silica matrix particles. There is virtually no leakage of the dyes and the fluorescence of the assembled particles is very stable. Much brighter fluorescence can be obtained from the encapsulated dyes than from the same dye in aqueous solution.

Ultrabright Fluorescent Silica Mesoporous Silica Nanoparticles: Control of Particle Size and Dye Loading

“…Note also that TM571, which has the lowest quantum yield, also shows a signifi cant redshift relative to other UFSNP. We may speculate that the decrease of quantum yield in this case is caused by the strong physical interaction between R6G A is the UV absorbance at a wavelength of 525 nm for UFSNP samples treated with HF (1 wt% solution); b) F area, DI water is the integrated area of fl uorescence emission spectra for UFSNP samples in DI water; High-resolution fl uorescence spectra of UFSNP, ultrabright (origami) micrometer-sized particles, [ 27 ] free R6G solution in water (1 μ M ), UFSNP dissolved in 1% HF solution, and R6G electrostatically physisorbed onto 60 nm solid silica particles. [ 29 ] TM571 UFSNP is shown separately as an example of the lowest quantum yield.…”

Optical Sensors Based on Opal Film and Silica Nanoparticles Modified with a Functional Dye

“…The luminescence properties of organic dyes are enhanced in the mesoporous nanostructures of silica and the light resistance of these dyes increases (Collinson, 2002;Sokolov et al, 2007). Thus, the binding of luminescent functional dyes with silica nanoparticles is promising for the use of modified silica nanoparticles as luminescence sensors.…”

Fluorescence properties of dye doped mesoporous silica

“…It was shown that there is a concentration threshold above which the formation of aggregates causes the presence of non-radiative dis-excitation patterns and the decrease of the fluorescence efficiency. To achieve mesoporous nanostructures with large emission efficiency is a goal still open, in particular for applications in photonics, such as solid state dye laser, and in the biomedicine field to achieve fluorescent nanoprobe for cell imaging [10][11][12][13][14][15][29][30][31][32][33][34][35]. In this respect in the last years new synthesis procedures were proposed to solve the exposed drawbacks to achieve ultrabright nanostructures by sealing the matrix by means of a templated procedure, by proper functionalization.…”