@article{TiseanuParvulescuKumkeetal.2009,
  author    = {Tiseanu, Carmen and P{\^a}rvulescu, Victor I. and Kumke, Michael Uwe and Dobroiu, Svako and Geßner, Andr{\´e} and Simon, Simion},
  title     = {Effects of support and ligand on the photoluminescence properties of siliceous grafted europium complexes},
  issn      = {1932-7447},
  doi       = {10.1021/Jp808411e},
  year      = {2009},
  abstract  = {Europium ions were introduced in SiO2 and MCM-41 via two different pathways: (1) grafting the europium complexes with two alkoxide structures, 3-(2-imidazolin-1-yl)-propyl-triethoxysilane (IPTES) and aminopropyltrimethoxysilane (APTMS), and (2) functionalization of the SiO2 support with silicon 4- carboxylbutyltriethoxide followed by subsequent addition of the europium ions. The new materials were characterized using nitrogen adsorption isotherms at -196 degrees C, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, Fourier transform infrared, NMR, DR-UV-vis, steady-state emission and excitation, and time-resolved photoluminescence spectroscopy. Spectral changes found in the time-resolved photoluminscence spectra strongly point to the distribution of europium ions on a range of environments in both SiO2 and MCM-41 supports. The average europium photoluminescence lifetimes decrease within the order: Eu3+-IPTES/SiO2 (550 mu s) > Eu3+-APTMS/SiO2 (425 mu s) > Eu3+-APTMS/MCM-41 (370 mu s) > Eu3+-IPTES/MCM-41 (320 mu s) > Eu3+-CABES/SiO2 (240 mu s). The photoluminescence quantum efficiency has the largest value, of 22\%, for Eu3+-IPTES/SiO2, while the most reduced value, of 9\%, was measured for Eu3+-CABES/SiO2.},
  language  = {en}
}