Hostname: page-component-78c5997874-m6dg7 Total loading time: 0 Render date: 2024-11-13T13:47:12.286Z Has data issue: false hasContentIssue false
  • English
  • Français

Organically-Modified Eu3+-Doped Silica Gels

Published online by Cambridge University Press:  10 February 2011

V. C. Costa ,
B. T. Stone  and
K. L. Bray
V. C. Costa
Affiliation:
Dep. de Eng. Metalurgica- UFMG- R. Espirito Santo 35, 2° andar, MG, 30160-030, Brasil
B. T. Stone
Affiliation:
Department of Chemical Engineering, University of Wisconsin, Madison, WI, 53706-1691
K. L. Bray
Affiliation:
Department of Chemical Engineering, University of Wisconsin, Madison, WI, 53706-1691
Get access

Abstract

We present results of fluorescence line narrowing (FLN) and lifetime studies of Eu3+-doped ormosils prepared from Si(OCH3)4 and CH3Si(OCH3)3, (CH3)2Si(OCH3)2, (C2H5)2Si(OCH3)2, and (n-C3H7)Si(OCH3)3 in various proportions. Similar results are also presented for Eu3+-doped gels derived from Si(OCH3)4 and fluorinated Eu3+ precursors (Eu(fod)3, (CF3SO3)3Eu, and (CF3CO2)3Eu·3H2O). The FLN studies indicated that significant Eu3+ clustering occurs in densified samples of both the organically modified and fluorinated compositions. Lifetime studies of the organically modified compositions showed longer Eu3+ lifetimes at low heat treatment temperatures relative to an unmodified sample. The difference in lifetime between modified and unmodified compositions decreased at high heat treatment temperatures as the organic substituents were driven from the matrix. The longest Eu3+ lifetimes were observed when the fluorinated Eu3+ precursors were used and persisted at high heat treatment temperatures. The lifetime studies indicate that the fluorinated precursors, and to a lesser extent organically modified precursors, are effective at reducing the water content in densified gels.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 443
Copyright
Copyright © Materials Research Society 1996

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Sol-Gel Optics III, edited by Mackenzie, J.D. (SPIE Proc. 2288, Bellingham, WA, 1994).Google Scholar
2. Reisfeld, R. and Jørgensen, C.K., in Structure and Bonding 77, 207 (1992).Google Scholar
3. Better CeramicsThrough Chemistry VI, edited by Cheetham, A.K., Brinker, C.J., Mecartney, M.L. and Sanchez, C. (Mater. Res. Soc. Proc.346, Pittsburgh, PA, 1994).Google Scholar
4. Ferrari, M., Campostrini, R., Carturan, G. and Montagna, M., Phil. Mag. B 65, 251 (1992).Google Scholar
5. Matthews, L.R., Wang, X. and Knobbe, E.T., J. Non-Cryst. Solids 178, 44 (1994).Google Scholar
6. Lochhead, M.J. and Bray, K.L., Chem. Mat. 7, 572 (1995).Google Scholar
7. Sen, S. and Stebbins, J.F., J. Non-Cryst. Solids 188, 54 (1995).Google Scholar
8. Thomas, I.M., Payne, S.A. and Wilke, G.D., J. Non-Cryst. Solids 151, 183 (1992).Google Scholar
9. Costa, V.C., Lochhead, M. J and Bray, K.L., Chem. Mat. 8, 783 (1996).Google Scholar
10. Sabbatini, N., and Guardigli, M., Mat. Chem. and Phys. 31, 13 (1992).Google Scholar
11. Capozzi, C.A. and Seddon, A.B., in Sol-Gel Optics III, edited by Mackenzie, J.D. (SPIE Proc. 2288, Bellingham, WA, 1994) p. 340.Google Scholar
12. Pope, E.J.A. and Mackenzie, J.D., J. Am. Cer. Soc. 76, 1325 (1993).Google Scholar
13. Armagan, G., DiBartolo, B., and Buoncristiani, A.M., J. Lumin. 44, 129 (1989).Google Scholar