Relationship between room temperature hole-burning in glasses and doped Eu-ion concentration
Relationship between room temperature hole-burning in glasses and doped Eu-ion concentration
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玻璃室温烧孔与Eu离子掺杂浓度的关系
DOI：
10.1016/s0022-2313(02)00284-3
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
A. Tomita
中科院分区：
文献类型：
--
作者：
N. Murase;Y. Kawasaki;A. Tomita
研究了掺Eu离子浓度在0.1 ~ 5mol%范围内对钠硼玻璃（35Na_2O-65B_2O_3）的光化学烧孔效应的影响。在我们的制备中，50-70%的Eu 3+被还原为Eu 2+。当Eu离子浓度超过1mol%时，荧光猝灭，同时光化学空穴开始燃烧。在室温下，光谱孔在2和3mol%之间的浓度下最有效地燃烧。低温实验表明，孔的形成有三种过程。一种是在1- 2 min内弛豫的瞬态过程。另一种仅在低温下观察到。第三个是持续观察，即使在室温下。这些成分的程度取决于Eu离子浓度。鉴于这些浓度依赖性，建议的室温烧孔机制是Eu 3+和Eu 2+之间的能量或电子转移。由玻璃的还原过程产生的缺陷中心可以起到帮助这种转移的作用。
Photochemical hole-burning in sodium-borate glass (35Na2O–65B2O3) was investigated as a function of doped Eu-ion concentration from 0.1 to 5mol% both at room temperature and 12K. In our preparation, 50–70% of Eu3+was reduced to Eu2+. As the concentration of Eu ion exceeded 1mol%, the fluorescence was quenched, and meanwhile the photochemical hole started burning. The spectral hole was most efficiently burnt at concentrations between 2 and 3mol% at room temperature. Low temperature experiment showed that there are three kinds of processes for the hole formation. One is a transient process relaxed within 1–2min. Another is observed only at low temperatures. The third one is observed persistently even at room temperature. The extent of these components depends on Eu-ion concentration. In view of these concentration dependences, the suggested mechanism of room temperature hole-burning is an energy or electron transfer between Eu3+and Eu2+. Defect centers created by reduction process of the glass may play a role to help this transfer.