Rare-earth clustering and aluminum codoping in sol-gel silica: Investigation using europium(III) fluorescence spectroscopy
- Univ. of Wisconsin, Madison, WI (United States)
Eu{sup 3+} fluorescence spectroscopy is used to investigate the clustering of rare-earth ions and the effectiveness of aluminum codoping in dispersing and isolating rare-earth ions in sol-gel silica monoliths. Fluorescence line-narrowing (FLN) studies are demonstrated as a useful tool in identifying clustered and isolated Eu{sup 3+}. Clustered Eu{sup 3+} is identified by the lack of a line-narrowing effect, which is attributed to energy transfer between adjacent Eu{sup 3+} ions. Clustering is shown to be significant, even in transparent samples with Eu{sup 3+} concentrations as low as 0.5 wt% Eu{sup 3+}. Addition of Al{sup 3+} as a codopant has a profound impact on the bonding and structure of Eu{sup 3+} in silica. Significant fluorescence line narrowing is observed, which suggests that Al{sup 3+} codoping is effective in dispersing and isolating Eu{sup 3+} ions in the silica matrix. Fluorescence decay studies provide evidence of increased Eu{sup 3+} hydroxylation in the Al{sup 3+}-containing samples. 28 refs., 4 figs., 1 tab.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 70276
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 3 Vol. 7; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fluorescence line narrowing studies of Eu{sub 3+}-doped silica gel-glasses
Fluorescence line-narrowing study of Eu{sup 3+}-doped sol-gel silica: Effect of modifying cations on the clustering of Eu{sup 3+}
Er{sup 3+}-doped silica and hybrid organic/inorganic silica gels
Book
·
Fri Dec 30 23:00:00 EST 1994
·
OSTI ID:51642
Fluorescence line-narrowing study of Eu{sup 3+}-doped sol-gel silica: Effect of modifying cations on the clustering of Eu{sup 3+}
Journal Article
·
Thu Feb 29 23:00:00 EST 1996
· Chemistry of Materials
·
OSTI ID:285011
Er{sup 3+}-doped silica and hybrid organic/inorganic silica gels
Book
·
Mon Dec 30 23:00:00 EST 1996
·
OSTI ID:427747