Abstract: Ce-doped borosilicate (BSG), phosphosilicate (PSG), and borophosphosilicate (BPSG) glasses (B:P:Si molar ratios 8:0:92, 0:8:92, and 8:8:84; Ce:Si molar ratio 1 10-4 to 1 10-2) were prepared by the sol-gel method. High-resolution transmission electron microscopy (HRTEM), 31P, 29Si, and 11B magic angle spinning nuclear magnetic resonance (MAS NMR), electron paramagnetic resonance (EPR), and UV-vis absorption investigations demonstrated that, in PSG and BPSG, Ce3+ ions interact with phosphoryl, [OdPO3/2], metaphosphate, [OdPO2/ 2O]-, and pyrophosphate, [OdPO1/2O2]2-, groups, linked to a silica network. This inhibits both CeO2 segregation and oxidation of isolated Ce3+ ions to Ce4+, up to Ce:Si ) 5 10-3. In BSG, neither trigonal [BO3/2] nor tetrahedral [BO4/2]- boron units coordinate cerium; thus, Ce3+ oxidation occurs even at Ce:Si ) 1 10-4, as in pure silica glass (SG). The homogeneous rare-earth dispersion in the host matrix and the stabilization of the Ce3+ oxidation state enhanced the intensity of the photoluminescence emission in PSG and BPSG with respect to BSG and SG. The energy of the Ce3+ emission band in PSG and BPSG matrixes agrees with the phosphate environment of the rare earth

Canevali, C., Mattoni, M., Morazzoni, F., Scotti, R., Casu, M., Musinu, A., et al. (2005). Stability of luminescent trivalent cerium in silica host glasses modified by boron and phosphorus. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 127(42), 14681-14691 [10.1021/ja052502o].

Stability of luminescent trivalent cerium in silica host glasses modified by boron and phosphorus

CANEVALI, CARMEN;MORAZZONI, FRANCA;SCOTTI, ROBERTO;
2005

Abstract

Abstract: Ce-doped borosilicate (BSG), phosphosilicate (PSG), and borophosphosilicate (BPSG) glasses (B:P:Si molar ratios 8:0:92, 0:8:92, and 8:8:84; Ce:Si molar ratio 1 10-4 to 1 10-2) were prepared by the sol-gel method. High-resolution transmission electron microscopy (HRTEM), 31P, 29Si, and 11B magic angle spinning nuclear magnetic resonance (MAS NMR), electron paramagnetic resonance (EPR), and UV-vis absorption investigations demonstrated that, in PSG and BPSG, Ce3+ ions interact with phosphoryl, [OdPO3/2], metaphosphate, [OdPO2/ 2O]-, and pyrophosphate, [OdPO1/2O2]2-, groups, linked to a silica network. This inhibits both CeO2 segregation and oxidation of isolated Ce3+ ions to Ce4+, up to Ce:Si ) 5 10-3. In BSG, neither trigonal [BO3/2] nor tetrahedral [BO4/2]- boron units coordinate cerium; thus, Ce3+ oxidation occurs even at Ce:Si ) 1 10-4, as in pure silica glass (SG). The homogeneous rare-earth dispersion in the host matrix and the stabilization of the Ce3+ oxidation state enhanced the intensity of the photoluminescence emission in PSG and BPSG with respect to BSG and SG. The energy of the Ce3+ emission band in PSG and BPSG matrixes agrees with the phosphate environment of the rare earth
Articolo in rivista - Articolo scientifico
Vetri luminescenti, sol-gel, epr, borosilicati, fosfosilicati
English
10-gen-2005
127
42
14681
14691
none
Canevali, C., Mattoni, M., Morazzoni, F., Scotti, R., Casu, M., Musinu, A., et al. (2005). Stability of luminescent trivalent cerium in silica host glasses modified by boron and phosphorus. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 127(42), 14681-14691 [10.1021/ja052502o].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/13930
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