Ternary europium complex Eu(tta) 3 phen was covalently bonded with the general mesoporous material SBA-15 and SBA-15-type of periodic mesoporous organosilica (PMO) material via impregnation of Eu(tta) 3 ·2H 2 O into phen-S15 and phen-PMO, respectively, through a ligand exchange reaction. The parent materials of phen-S15 and phen-PMO were synthesized by co-condensation of tetraethylorthosilicate (TEOS) or 1,2-bis(triethoxysilyl)ethane (BTESE) and the functionalized chelate ligand 5-( N, N -bis(3-triethoxysilyl)propyl)ureyl-1,10-phenanthroline (phen-Si) in the presence of Pluronic P123 surfactant as template, which were confirmed by SEM, XRD, FTIR, 29 Si CP-MAS NMR, and N 2 adsorption measurements. The photophysical properties of the hybrids, such as the photoluminescence (PL) spectra, PL intensities, symmetry properties, luminescence decay times, and Judd−Ofelt parameters, were investigated in detail. Compared to the sample of Eu(tta) 3 phen-PMO, the mesoporous hybrid material Eu(tta) 3 phen-S15 exhibited longer luminescent decay time and higher luminescence intensity, emission quantum efficiency ( q ), and absolute quantum yield (Φ), which were quantitatively stressed by the emission spectra and the calculated values of q of Eu 3+ ion. Meanwhile, the result of thermal treatment demonstrated that the europium complex in Eu(tta) 3 phen-S15 material possessed a better thermal stability than that in Eu(tta) 3 phen-PMO. The above photoluminescence and thermal stability features indicated that SBA-15 is a better host material for lanthanide complex than SBA-15-type PMO material.
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Guo et al. (2009) studied this question.
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