Organically-modified Eu{sup 3+}-doped silica gels
The authors present results of fluorescence line narrowing (FLN) and lifetime studies of Eu{sup 3+}-doped ormosils prepared from Si(OCH{sub 3}){sub 4} and CH{sub 3}Si(OCH{sub 3}){sub 3}, (CH{sub 3}){sub 2}Si(OCH{sub 3}){sub 2}, (C{sub 2}H{sub 5}){sub 2}Si(OCH{sub 3}){sub 2}, and (n-C{sub 3}H{sub 7})Si(OCH{sub 3}){sub 3} in various proportions. Similar results are also presented for Eu{sup 3+}-doped gels derived from Si(OCH{sub 3}){sub 4} and fluorinated Eu{sup 3+} precursors (Eu(fod){sub 3}, (CF{sub 3}SO{sub 3}){sub 3}Eu, and (CF{sub 3}CO{sub 2}){sub 3}Eu{center_dot}3H{sub 2}O). The FLN studies indicated that significant Eu{sup 3+} clustering occurs in densified samples of both the organically modified and fluorinated compositions. Lifetime studies of the organically modified compositions showed longer Eu{sup 3+} lifetimes at low heat treatment temperatures relative to an unmodified sample. The difference in lifetime between modified and unmodified compositions decreased at high heat treatment temperatures as the organic substituent were driven from the matrix. The longest Eu{sup 3+} lifetimes were observed when the fluorinated Eu{sup 3+} precursors were used and persisted at high heat treatment temperatures. The lifetime studies indicate that the fluorinated precursors, and to a lesser extent organically modified precursors, are effective at reducing the water content in densified gels.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 427727
- Report Number(s):
- CONF-960401--; ISBN 1-55899-338-X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
ALKOXIDES
AQUEOUS SOLUTIONS
CHEMICAL COMPOSITION
DOPED MATERIALS
EUROPIUM NITRATES
EUROPIUM OXIDES
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
FLUORINE COMPOUNDS
HEAT TREATMENTS
HYDROLYSIS
LASER RADIATION
LIFETIME
MATERIALS
OPTICAL EQUIPMENT
OPTICAL PROPERTIES
SAMPLE PREPARATION
SILICON OXIDES
SOL-GEL PROCESS