Formation of Sm2+ lons in Sol-Gel-Derived Glasses of the System Na2 O-Al2O3-SiO2 |
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| Authors: | Masayuki Nogami Naoya Hayakawa Naoya Sugioka Yoshihiro Abe |
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| Affiliation: | Department of Materials Science and Engineering, Nagoya Institute of Technology, Showa, Nagoya 466, Japan |
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| Abstract: | Samarium ions (Sm2+) incorporated into aluminosilicate glasses by a sol-gel process showed persistent spectral hole burning at room temperature. Gels of the system Na2O-Al2O3SiO2 synthesized by the hydrolysis of Si(OC2H5)4, Al(OC4H9)3, CH3 COONa, and SmCl3·6H2O were heated in air at 500°C, then reacted with H2 gas to form Sm2+ ions. Whereas Al3+ ions effectively dispersed the Sm3+ ions in the glass structure, Na+ ions were not effective. The Al2O3-SiO2 glasses proved appropriate for reacting the Sm3+ ions with H2 gas and exhibited the intense photoluminescence of Sm2+ ions. The reaction of Sm3+ ions with H2 in the Al2O2-SiO2 glasses was determined by first-order kinetics, and the activation energy equaled 95 kJ/mol. At 800°C, the maximum photoluminescence of the Sm2+ ions was achieved within 20 min. |
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