| Autor: |
A.J. Silversmith, K.R. Hoffman, K. E. Arpino, D.M. Boye |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Journal of Luminescence. 131:453-456 |
| ISSN: |
0022-2313 |
| DOI: |
10.1016/j.jlumin.2010.09.046 |
| Popis: |
A novel technique is introduced for studying how rare earth ions are incorporated into the matrix of porous materials. Tb 3 + -doped silica sol-gel is annealed to form porous glass and immersed in an aqueous Gd(NO 3 ) 3 solution. Re-heating removes the liquid and deposits Gd 3+ ions on the internal pore surfaces. Spectroscopic investigation of Gd 3+ → Tb 3+ energy transfer yields information about the location of Tb 3+ dopant ions relative to pore surfaces. Results from post-annealing immersion experiments indicate that most Tb 3+ dopant ions are close to pore surfaces when sol-gel glass is annealed to 700 °C. The observed energy transfer decreases with higher annealing temperatures, indicating that Tb 3+ dopants in densified regions are isolated from Gd 3+ ions deposited on pore surfaces. Al 3+ co-doping affects both the overall sample density and the degree of Gd 3+ → Tb 3+ interaction in post-annealing immersion samples. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect