摘要
采用吸收光谱、电子顺磁共振谱和光致发光谱对掺Ce多组分硅酸盐玻璃K509在10 MeV电子辐照下的色心动力学进行了研究。结果表明,电子辐照引起K509玻璃可见光透过率降低的色心类型为非桥氧空穴色心HC1和HC2。在剂量率一定的情况下,色心浓度随总剂量的增大呈指数函数增大;在总剂量一定的情况下,色心浓度随剂量率增大呈指数函数减小。Ce3+荧光强度的变化表明辐照过程中Ce3+浓度与辐照总剂量负相关,与辐照剂量率正相关,验证了掺Ce玻璃耐辐照机理:Ce3+吸收辐照产生的空穴从而抑制空穴色心HC1和HC2的形成,且不引入额外的可见光波段吸收。通过对Ce3+宽带荧光峰进行高斯拟合,得到了K509中Ce3+能级结构图。
The coloration of Ce-doped multicomponent silicate glass（type K509） irradiated by 10 MeV electrons was investigated by absorption spectra, electron paramagnetic resonance and photoluminescence spectra. The results show that non-bridging oxygen hole centers（HC1 and HC2） are induced in K509 glasses after electron irradiation, leading to significant degradation of visible transmission. The concentration of color center grows in an exponential law with the increase of radiation dose at the same dose rate, and decreases in exponential decay law with radiation dose rate at the same total dose. According to photoluminescence spectra, the concentration of Ce^3＋ ions has a negative correlation with radiation dose, and has a positive correlation with dose rate, which proves the mechanism of radiation-hardness in cerium-doped glasses. Ce^3＋ ions capturing holes induced by electron irradiation to form Ce^4＋ inhibits the formation of hole trapped color centers, HC1 and HC2, which avoids additional absorption in visible light range. The energy level diagram of Ce^3＋ in K509 glasses is also obtained by Gaussian resolution of the broad asymmetric emission spectra of Ce^3＋.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第10期1018-1022,共5页
Journal of Inorganic Materials
关键词
耐辐照玻璃
铈离子
电子辐照
色心
动力学
radiation-hard glass
cerium ions
electron irradiation
color center
kinetics
