Abstract
Highly fluorescent materials have been prepared by incorporation of a zinc complex in mesoporous silica thin films with ordered pore structure. The zinc complex has been introduced into the mesoporous materials via impregnation in an ethanol solution. The incorporation into the films has been monitored by UV–Vis, Fourier transform infrared spectroscopy and spectroscopic ellipsometry. After 18 h of immersion in the doping solution the films showed strong blue emission, increase in the refractive index. Leaching experiments performed by immersing the samples in ethanol or tetrahydrofuran have shown that the chromophore is retained in the porous matrix.
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Notes
The Cauchy dispersion equation: n(λ) = An + Bn/λ2 + Cn/λ4, allows calculating the refractive index as a function of the wavelength. An is a parameter related to the average refractive index of the material, while Bn and Cn are parameters that provide the shape or curvature of the n(λ) curve.
For a two-components material, the refractive index in the Bruggemann approximation is expressed as: \( f_{v} \frac{{n_{v}^{2} - n^{2} }}{{n_{v}^{2} + 2n^{2} }} + f_{{{\text{SiO}}_{2} }} \frac{{n_{{{\text{SiO}}_{2} }}^{2} - n^{2} }}{{n_{{{\text{SiO}}_{2} }}^{2} + 2n^{2} }} = 0 \) while f v , n v and \( f_{{{\text{SiO}}_{2} }}\), \( n_{{{\text{SiO}}_{2} }}\) are the volume fractions and the refractive index of the pores void and silica, respectively.
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Acknowledgement
This research was supported by the Italian Ministero dell’Università e della Ricerca (MiUR) through the Centro di Eccellenza CEMIF.CAL, FIRB, FIRB2003 (RBNE033KMA) and PRIN grants. The authors thank Dr. E. Vizza for part of the synthetic work.
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Aiello, D., Malfatti, L., Kidchob, T. et al. Blue-emitting mesoporous films prepared via incorporation of luminescent Schiff base zinc(II) complex. J Sol-Gel Sci Technol 47, 283–289 (2008). https://doi.org/10.1007/s10971-008-1804-2
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DOI: https://doi.org/10.1007/s10971-008-1804-2