Tuning the Photoluminescence of Silsesquioxanes with Short Substituted Urea.

M. L. GOMEZ, D. P. FASCE, R. J. J. WILLIAMS, C. M. PREVITALI, LIBOR MATÌJKA, JOSEF PLEšTIL, JIØÍ BRUS

MACROMOLECULAR CHEMISTRY AND PHYSICS

Wiley

Año: 2008 vol. 209 p. 634 - 642

1022-1352

The polycondensation of a precursor synthesized by the reaction of 3-(anilinepropyl)-trimethoxysilane with 3-(isocyanatopropyl)triethoxysilane led to a silsesquioxane bearing a substituted urea group in the short organic bridge. The self-assembly of organic bridges, analyzed by SAXS and FTIR spectra, could be controlled by varying the conditions of the synthesis. Depending on the size of organic clusters, the silsesquioxane exhibited photoluminescence either in the green or red regions of the spectra, or an emission that could be tuned in the whole visible region by the excitation wavelength.