Surface-luminescence from thermally reduced bismuth-doped sodium aluminosilicate glasses
Surface-luminescence from thermally reduced bismuth-doped sodium aluminosilicate glasses
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DOI：
10.1016/j.jnoncrysol.2012.09.021
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发表时间：
2012-12
影响因子：
3.5
通讯作者：
K. H. Nielsen;Morten M. Smedskjær;M. Peng;Y. Yue;L. Wondraczek
中科院分区：
文献类型：
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作者：
K. H. Nielsen;Morten M. Smedskjær;M. Peng;Y. Yue;L. Wondraczek
研究了氢退火对铋掺杂钠铝硅酸盐玻璃光学性质的影响。铋在熔融态玻璃中的氧化还原状态受组成控制，即，只有在低光学碱度的玻璃中才能观察到近红外发光。在热还原时，来自Bi 3+和最终少量Bi 2+的可见光发射显著降低，这取决于热处理时间和温度以及玻璃组成。还发现氢处理会导致近红外发射强度降低，同时在表面区域形成金属铋颗粒。表面着色以及可见光发光的减少遵循Arrhenius动力学，表明氢渗透是速率控制过程。在空气中再退火时，热还原对光学性质的影响仅在有限程度上是可逆的。
We report on the effect of hydrogen annealing on the optical properties of bismuth-doped sodium aluminosilicate glasses. The redox state of bismuth in the as-melted glasses is governed by the composition, viz., NIR luminescence is observed only in the glasses with low optical basicity. Upon thermal reduction, visible emission from Bi3+and, eventually, minor amounts of Bi2+is significantly lowered, depending on heat-treatment time and temperature, and glass composition. Hydrogen treatment was also found to result in a decrease of the NIR emission intensity and, at the same time, formation of metallic bismuth particles in the surface region. Surface-tinting as well as the decrease of visible luminescence follow Arrhenian kinetics, suggesting that hydrogen permeation is the rate-governing process. Upon re-annealing in air, the effects of thermal reduction on the optical properties are reversible only to a limited extent.