Radiophotoluminescence of Cu-doped silica glass derived from phase-separated sodium borosilicate glass
Radiophotoluminescence of Cu-doped silica glass derived from phase-separated sodium borosilicate glass
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DOI：
10.1063/5.0044309
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发表时间：
2021-03
期刊：
影响因子：
1.6
通讯作者：
Yuya Takada;Keigo Yamamoto;A. Kinomura;Takeshi Saito;N. Ichinose;A. Okada;T. Wakasugi;K. Kadono-K.-Kado
中科院分区：
文献类型：
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作者：
Yuya Takada;Keigo Yamamoto;A. Kinomura;Takeshi Saito;N. Ichinose;A. Okada;T. Wakasugi;K. Kadono-K.-Kado
辐射光致发光是电离辐射引起的材料中最有趣的现象之一，有望在各个领域的辐射测量中得到应用。研究了掺少量铜的石英玻璃经X射线和60Coγ射线照射后的辐射光致发光。以分相后的硼硅酸盐玻璃为原料，采用硝酸铜溶液浸渍烧结法制备了掺铜二氧化硅玻璃。在辐照产生的各种缺陷中，在电子自旋共振谱中观察到了硼氧空穴中心(Buchs)，即捕获在四配位硼上的氧空穴。在辐照前，在2.5 eV处观察到一条光致发光带，该光致发光带属于Cu+离子的3d94s1→3D10跃迁。辐照后发光强度显著增强，并在2.1 eV处出现新的发光带。随着照射剂量的增加，两条谱带的强度均呈正比增加。这是由于Cu2+通过捕获辐射产生的电子而转化为Cu2+离子。对其发光衰减进行了测量，结果表明，2.5eV和2.1eV发光的寿命分别为38uE S和125ug S。当热处理温度达到300℃时，诱导光致发光增强，高于350℃时，诱导光致发光降低。讨论了热处理对Buchs辐照后的光致发光和热稳定性的影响。500℃以上的热处理使玻璃恢复到辐照前的初始状态。
Radiophotoluminescence, one of the most interesting phenomena induced in materials by ionizing radiation, is expected to be applied for radiation measurements in various fields. The radiophotoluminescence of silica glasses doped with a small amount of copper was investigated after exposure to x rays and 60Co γ rays. The Cu-doped silica glasses were prepared from porous silica glass, obtained from a phase-separated borosilicate glass, through impregnation of the porous glass in Cu(NO3)2 solutions and sintering it. Among various types of defects generated in the glass by the irradiation, boron oxygen hole centers (BOHCs), i.e., holes trapped in oxygen bonded to fourfold-coordinated boron, were observed in electron spin resonance spectra. Before irradiation, a photoluminescence band attributed to the 3d94s1 → 3d10 transition of Cu+ ions was observed at 2.5 eV. The luminescence intensity increased remarkably after irradiation, and in addition, a new luminescence band at 2.1 eV appeared. The intensities of both bands increased proportionally with the irradiation dose. This was due to the conversion of Cu2+ to Cu+ ions by the capture of electrons generated by the irradiation. The luminescent decay was measured, which revealed that the lifetimes of the 2.5-eV and 2.1-eV emissions were 38 µs and 125 µs, respectively. The induced photoluminescence increased after heat treatment up to a temperature of 300 °C and decreased above 350 °C. The effects of heat treatment on the photoluminescence after irradiation and the thermal stability are discussed for BOHCs. A heat treatment of above 500 °C returned the glass near its initial state before irradiation.