Spectroscopic investigations of spirooxazine and spiropyran incorporated in hybrid organic/inorganic silica particles

Jonas Oertegren; Nina Andersson; Peter Alberius; Lennart Bergstroem; Mikael Lindgren

doi:10.1117/12.624536

22 August 2005 Spectroscopic investigations of spirooxazine and spiropyran incorporated in hybrid organic/inorganic silica particles

Jonas Oertegren, Nina Andersson, Peter Alberius, Lennart Bergstroem, Mikael Lindgren

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Proceedings Volume 5925, Nanophotonic Materials and Systems II; 592511 (2005) https://doi.org/10.1117/12.624536
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The incorporation of photochromic dyes in mesostructured silica particles and the subsequent incorporation of the particles in latex to create solid films with relatively large, yet controllable, thickness, was recently reported [N. Andersson, P. C. A. Alberius, J. Skov Pedersen, L. Bergstroem, Microporous and Mesoporous Materials, 2004, 72, 175-183; N. Andersson, P. Alberius, J. Oertegren, M. Lindgren, L. Bergstroem, J. Mater. Chem., 2005, in press.] As photochromic dyes, spirooxazine (SO) and spiropyran (SP) were used. The films are transparent in day-light at room temperature and become coloured upon UV exposure. The films have a potential for usage as display systems, optical switches and optical memory devices. The synthesis of the SO/SP doped silica particles and the making of solid films is briefly described, and the spectral properties of SO/SP in various environments - in the film, in solution, as pristine dye powder and as silica particle powder - were studied by absorbance and fluorescence measurements, including time-resolved fluorescence decay measurements. It was found that the spectral properties of the photo-chromic dyes in the films are similar to those observed in solution, indicating that they are well-dispersed in the organic phase of the silica particles, which, in turn, are well-dispersed in the latex film.

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Jonas Oertegren, Nina Andersson, Peter Alberius, Lennart Bergstroem, and Mikael Lindgren "Spectroscopic investigations of spirooxazine and spiropyran incorporated in hybrid organic/inorganic silica particles", Proc. SPIE 5925, Nanophotonic Materials and Systems II, 592511 (22 August 2005); https://doi.org/10.1117/12.624536

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KEYWORDS

Silica

Luminescence

Surface plasmons

Latex

Particles

Atmospheric particles

Absorbance

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