Transparent gel and xerogel of thorium phosphate: optical spectroscopy with: Nd3+,Eu3+,Cr3+ and Rhodamine 6G
Chemical conditions for thorium phosphate gel preparation have been determined. The transparency is of good optical quality and the gel is very stable for a long time. Under drying condition, this gel can give rise to the xerogel which is still transparent. We can also prepare this xerogel by simple evaporation at room temperature of a very concentrated solution of thorium phosphate. From this viscous medium, the xerogel can be obtained in various kinds of shapes : threads, slabs and blocks. Solidification time depends on the final volume desired and spreads from few minutes to several weeks. Absorption spectrum of pure gel and xerogel have been recorded. Gel and xerogel doped with very well known probes like Nd3+ and Er3+ were examined to compare their optical properties with aqueous medium of the same chemical composition. Eu3+ doped gel and xerogel were also studied using their fluorescence properties. The optical properties of Cr3+ in doped gel and xerogel allowed us to determine the kinetics of hydration sphere modification during the drying period. Finally, as xerogel synthesis takes place at room temperature, fragile organic dye can be used as dopant, so Rhodamine 6G absorption and emission spectra have been studied in these conditions. When, at that time, the xerogel is doped with Coumarin 460 and Tb3+ an energy transfer is observed between dye and Tb3+ ions, which contributes to enhance the fluorescence of Tb3+ ions. Eu3+ behaves similarly. In conclusion, gel and xerogel of thorium phosphate tested with usual probes such as 3d, 4f ions and dyes seem to be very promising matrices.
- Research Organization:
- Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire
- OSTI ID:
- 7207055
- Report Number(s):
- AD-P-006424/6/XAB
- Resource Relation:
- Other Information: This articles is from 'Sol-Gel Optics: Proceedings SPIE-The International Society for Optical Engineering Held in San Diego, California on 11-13 July 1990. Volume 1328, AD-A249 986, p194 -200
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electrochromism of phosphotungstic acid incorporated in titanium alkoxide xerogel films
The incorporation and thermal stability of organic dyes in dialkylsiloxane-oxide matrices
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
GELS
OPTICAL PROPERTIES
SYNTHESIS
ABSORPTION
CHEMICAL COMPOSITION
CHROMIUM
COUMARINS
DRYING
DYES
EMISSION SPECTRA
ENERGY TRANSFER
EUROPIUM
EVAPORATION
FLUORESCENCE
HYDRATION
KINETICS
LIGHT TRANSMISSION
NEODYMIUM
SOLIDIFICATION
SPECTRA
STABILITY
THORIUM PHOSPHATES
ACTINIDE COMPOUNDS
ANTICOAGULANTS
COLLOIDS
DISPERSIONS
DRUGS
ELEMENTS
HEMATOLOGIC AGENTS
LUMINESCENCE
METALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTHS
SOLVATION
SORPTION
THORIUM COMPOUNDS
TRANSITION ELEMENTS
360606* - Other Materials- Physical Properties- (1992-)
400201 - Chemical & Physicochemical Properties