Effect of Al3+ and Ti4+ ions on the laser reduction of Sm3+ ion in glass
Effect of Al3+ and Ti4+ ions on the laser reduction of Sm3+ ion in glass
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Al3和Ti4离子对激光还原玻璃中Sm3离子的影响
DOI：
10.1016/j.jlumin.2004.12.010
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发表时间：
2005
影响因子：
3.6
通讯作者：
T. Hayakawa
中科院分区：
文献类型：
--
作者：
M. Nogami;G. Kawamura;G. Park;Hongpeng You;T. Hayakawa
用飞秒激光脉冲改变了掺杂在al2o3和TiO2硅酸盐玻璃中的Sm3+离子的价态。当掺杂tio2 - sio2玻璃时，激光照射Sm3+离子没有变化。另一方面，在含al2o3的玻璃中，Sm3+离子被还原为Sm2+。荧光窄线光谱表明，Ti4+离子溶解在硅网络中，占据形成Si-O-Ti键的四面体位点，而Al3+离子占据四面体和八面体位点。激光照射有利于在Al-O八面体的氧离子中形成空穴缺陷中心。氧离子释放的电子被最近的Sm3+离子捕获，形成Sm2+。另一方面，在含Ti4+的玻璃中，电子被困在Ti4+离子中，没有形成Sm2+离子。通过时间分辨荧光光谱比较了Sm2+离子和缺陷中心的荧光性质。
Femtosecond laser pulses were used to change the valence of Sm3+ions doped in silicate glasses consisting of Al2O3and TiO2. When doped in TiO2–SiO2glass, no change was observed in Sm3+ions by laser irradiation. On the other hand, Sm3+ions were reduced to Sm2+in Al2O3-containing glasses. Fluorescence line-narrowing spectra indicate that Ti4+ions are dissolved in silica network and occupy the tetrahedral site forming Si–O–Ti bonds, while Al3+ions occupy tetrahedral and octahedral sites. The laser irradiation carries to form the hole-defect centers in the oxygen ions in the Al–O octahedral. The released electrons from oxygen ions are captured in the nearest neighboring Sm3+ions, resulting in the formation of Sm2+. On the other hand, in the Ti4+-containing glasses, the electrons are trapped in Ti4+ions and no Sm2+ions are formed. The fluorescence properties of the Sm2+ions and defect centers were compared from the time-resolved fluorescence spectra.