Mesoporous Material Eu Research Articles

Encapsulation of Lanthanide β-diketone Hybrids in Organic Oligomer Poly(ethylene glycol) 400

The organic ligand 2-Thenoyltrifluoroacetone (TTA) which was selected as molecular bridge for sensitization of europium and terbium ions were modified by 3-(triethoxysilyl)-propylisocyanate (TEPIC) to obtain the hybrid precursor TTA-Si. Then the solution of Eu(NO3)3 and Tb(NO3)3 were added in the presence of tetraethylorthosilicate (TEOS). The binary lanthanide organic/inorganic hybrid material were obtained. The ternary hybrid materials were obtained by adding the solution of Eu(NO3)3 and Tb(NO3)3 and Poly (ethylene glycol) (PEG400). We investigated the thermal stability and luminescence properties of hybrids and found that the ternary hybrid materials exhibit better thermal stability and stronger emission intensity. Furthermore, compared with the binary mesoporous material Eu-(TTA-Si)3 and Tb-(TTA-Si)3, the ternary mesoporous material Eu-(TTA-Si)3-PEG and Tb-(TTA-Si)3-PEG exhibits the characteristic emission of the Eu3+ and Tb3+ ion with a higher luminescence intensity, suggesting that the introduction of PEG is of benefit for the sensitization of Eu3+ and Tb3+ luminescence, by replacing H2O groups that can quench the luminescence of Eu3+ and Tb3+ ions.

Luminescent Hybrids of Eu<sup>3+</sup> Complexes Covalently Bonded with Mesoporous Silica and PMAA

Binary organic-inorganic mesoporous hybrid materials were prepared by covalntly grafting Lanthanide (III) (Eu) trifluoroacetylaceton (TAA) complexes to the ordered meosoporous silica SBA-15 via hydrothermal method and hydrolysis and co-polycondensation method with the surfactant P123 and TEOS. Besides, Novel ternary lanthanide (III) (Eu) organic-inorganic-polymeric mesoporous hybrid materials have been synthesized as well through the introduction of the organic polymer PMAA to the binary system with covalent bond. We investigated the thermal stability and luminescence properties of hybrids and found that the ternary hybrid materials exhibit better thermal stability and stronger emission intensity. Furthermore, compared with the binary mesoporous material Eu (TAA-SBA-15)3, the ternary mesoporous material Eu (TAA-SBA-15)3PMMA exhibits the characteristic emission of the Eu3+ ion with a higher luminescence Intensity, suggesting that the introduction of polymer PMMA into the mesoporous matrix is of benefit for the sensitization of Eu3+ luminescence, by replacing H2O groups that can quench the luminescence of Eu3+ ion.

Eu3+, Tb3+/β-diketonate functionalized mesoporous SBA-15/GaN composites: Multi-component chemical bonding assembly, characterization, and luminescence

GaN-functionalized rare earth (Eu3+ and Tb3+) organic/inorganic mesoporous nanocomposites have been successfully synthesized (designated as RE(LSBA-15)3(LGaN); RE=Eu, Tb; L=TAASi, BTASi). The organosilane precursor materials (LSBA-15) are synthesized by co-condensation of tetraethylorthosilicate (TEOS) and the functionalized β-diketones (TAASi and BTASi) in the presence of Pluronic P123 surfactant as a template. The modified β-diketones ligands are also used to covalently bond with surface-modified GaN and formed another precursor LGaN. Both of the precursors can coordinate with rare earth ions to synthesize the final mesoporous materials via a sol–gel process. FTIR, TEM, XRD, and nitrogen (N2) adsorption/desorption measurements are employed to characterize the mesostructure of RE(LSBA-15)3(LGaN). The luminescence properties and thermogravimetric analysis of all the prepared materials are characterized in detail, and the results reveal that a series of uniformed mesopore structure hybrid materials has been achieved. The mesoporous material Eu(BTASiSBA-15)3(BTASiGaN) has better luminescence intensity, higher quantum efficiency, and longer lifetime than Eu(TAASiSBA-15)3(TAASiGaN). While the nanocomposite Tb(TAASiSBA-15)3(TAASiGaN) revealed the strongest characteristic emission of Tb3+ ions than Tb(BTASiSBA-15)3(BTASiGaN), the excellent luminescent properties and thermal stability enable the hybrid mesoporous material to have potential applications in optical field.

Luminescent ternary inorganic-organic mesoporous hybrids Eu(TTASi-SBA-15)phen: covalent linkage in TTA directly functionalized SBA-15

A novel kind of luminescent ternary organic-inorganic mesoporous hybrid Eu(TTASi-SBA-15)(3)phen (phen = 1,10-phenanthroline) has been assembled by the Eu(3+) complex covalently attached to the TTA directly Functionalized ordered mesoporous SBA-15, which is characterized to have high surface area, uniformity in the mesostructure and crystallinity. The efficient intramolecular energy transfer in mesoporous material Eu(TTASi-SBA-15)(3)phen mainly occurs between the modified ligand TTASi and the central Eu(3+) ion. Furthermore, compared with the binary mesoporous material Eu(TTASi-SBA-15)(3), the ternary mesoporous material Eu(TTASi-SBA-15)(3)phen exhibits the characteristic emission of the Eu(3+) ion with a higher luminescence quantum efficiency intensity and a longer lifetime, suggesting that the introduction of ligand phen into the mesoporous matrix is of benefit for the sentisization of Eu(3+)luminescence, by replacing H(2)O groups that can quench the luminescence of Eu(3+) ions.

Mesoporous hybrids containing Eu 3+ complexes covalently bonded to SBA-15 functionalized: Assembly, characterization and photoluminescence

A novel series of luminescent mesoporous organic–inorganic hybrid materials has been prepared by linking Eu 3+ complexes to the functionalized ordered mesoporous SBA-15 which was synthesis by a co-condensation process of 1,3-diphenyl-1,3-propanepione (DBM) modified by the coupling agent 3-(triethoxysilyl)-propyl isocyanate (TEPIC), tetraethoxysilane (TEOS), Pluronic P123 surfactant as a template. It was demonstrated that the efficient intramolecular energy transfer in the mesoporous material Eu(DBMSi-SBA-15) 3phen mainly occurred between the modified DBM (named as DBM-Si) and the central Eu 3+ ion. So the Eu(DBMSi-SBA-15) 3phen showed characteristic emission of Eu 3+ ion under UV irradiation with higher luminescence quantum efficiency. Moreover, the mesoporous hybrid materials exhibited excellent thermal stability as the lanthanide complex was covalently bonded to the mesoporous matrix.

Covalently bonding assembly and photophysical properties of luminescent molecular hybrids Eu–TTA–Si and Eu–TTASi–MCM-41 by modified thenoyltrifluoroacetone

In the context, the two novel kinds of hybrid materials, TTA–Si directly chemically bonded molecular hybrids and the corresponding MCM-41 host assembling hybrids were prepared. The organic–inorganic mesoporous luminescent materials were synthesized by linking Eu 3+ complexes to the functionalized ordered mesoporous MCM-41 with modified thenoyltrifluoroacetone (TTA–Si) by co-condensation of tetraethoxysilane (TEOS) in the presence of the cetyltrimethylammonium bromide (CTAB) surfactant as template. Thenoyltrifluoroacetone (TTA) was grafted with coupling agent 3-(triethoxysilyl)-propyl isocyanate and the as-derived functional bridge molecule (denoted as TTA–Si) was introduced into inorganic polymeric host MCM-41 through covalent bonds, resulting in the molecular hybrid material. The luminescence properties of these resulting materials were characterized in detail, and the results reveal that they all have high surface area, uniformity in the mesostructure and crystallinity. The efficient intramolecular energy transfer in mesoporous material Eu–TTASi–MCM-41 mainly occurs between the modified ligand TTA–Si and the central Eu 3+ ion. In addition, the constructed covalently bonded hybrids present the longer luminescent lifetimes than common Eu(III) β-diketones complexes for improvement of stability. Especially the mesoporous luminescent material Eu–TTASi–MCM-41possesses high luminescence quantum efficiency .