Sol gel technology is based on hydrolysis followed by polycondensation of variety of precoursors.

The process starts with solution and terminates with solid materials that may have a required shape of the bulks or alternatively thin films maybe formed on glass quartz, semiconductors or metals.

As an example prepared in our laboratory are systems such as silica, titania, zirconia, silica glymo (3-glycidopropyxy trimetoxy silane) zirconia silica-polyurethane (ZSUR) (1), (2).

During the formation of the polymeric systems a large number of active additives were included resulting in new optical materials:

Tunable lasers in the visible range (3), Sensors (4), Active waveguides (5), Photochromic materials (6), Electrochromic materials (7), Semiconductor quantum dots (8), Solar materials (9).

We shall present the scheme of sol gel formation incorporating the new laser dyes, emission and laser dyes threshold of the tunable lasers, and preparation of quantum dots and rods as well as their optical and electronic properties of our materials.

References

1. R. Reisfeld, et al., Polymers for Advanced Technologies, 15 (2004) 291-301.

2. R. Reisfeld, Optical Spectra and Chemical Bonding, Structure and Bonding, 106 (2003) 209-235.

3. Renata Reisfeld, Sol gel processed lasers, Sol-Gel Technology (Handbook) Vol. 3, Chap.12, (2004) 239-261, ed. Summio Sakka.

4. O. Wolfbeis, Reisfeld, et al. Structure and Bonding 85, Springer-Verlag (1996) 51-98.

5. Y. Sorek, R. Reisfeld et al., Appl. Phys. Letters, 66, (1995) 1169-1171

6. M. Zayat, D. Einot & R. Reisfeld, J. of Sol-Gel Science and Technology, 10 (1997), 203-211.

7. M. Zayat, R. Reisfeld et al, Solar Energy Materials and Solar Cells, 54 (1998) 109-120

8. R. Reisfeld et al., Semiconductor quantum size particles and rare earths ions (Eu+3, Tb+3) In amorphous sol-gel films, World Scientific, Eds. B. Di Bartolo and Xuesheng Chen (2000) 341-358.

9. R. Reisfeld et al., Solar Energy Materials and Solar Cells, 33 (1994) 41

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