掺铈多组分硅酸盐玻璃电子辐照着色研究

doi:10.15541/jim20140016

摘要/Abstract

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。

关键词: 耐辐照玻璃, 铈离子, 电子辐照, 色心, 动力学

Abstract:

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 Ce³⁺ 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. Ce³⁺ ions capturing holes induced by electron irradiation to form Ce⁴⁺ inhibits the formation of hole trapped color centers, HC1 and HC2, which avoids additional absorption in visible light range. The energy level diagram of Ce³⁺ in K509 glasses is also obtained by Gaussian resolution of the broad asymmetric emission spectra of Ce³⁺.

Key words: radiation-hard glass, cerium ions, electron irradiation, color center, kinetics

中图分类号:

TB321

傅鑫杰, 宋力昕, 李家成. 掺铈多组分硅酸盐玻璃电子辐照着色研究[J]. 无机材料学报, 2014, 29(10): 1018-1022.

FU Xin-Jie, SONG Li-Xin, LI Jia-Cheng. Coloration of Ce-doped Multicomponent Silicate Glasses by Electron Irradiation[J]. Journal of Inorganic Materials, 2014, 29(10): 1018-1022.

图/表 9

图1 不同剂量电子辐照后K509吸收变化(剂量率:1 kGy/s)

Fig. 1 Induced absorption spectra of K509 glass after being irradiated with different doses (dose rate: 1 kGy/s)

图2 可见吸收带积分面积与剂量的关系(剂量率: 1 kGy/s)

Fig. 2 Integrated absorption area in visible band as a function of dose (dose rate: 1 kGy/s)

图3 K509玻璃辐照后EPR谱(总剂量: 1000 kGy)

Fig. 3 EPR spectra of K509 glass after being irradiated by electron radiation (dose: 1000 kGy)

图4 不同剂量辐照后K509激发谱和发射谱(剂量率: 1 kGy/s)

Fig. 4 Excitation and emission spectra of K509 glasses after being irradiated with different doses (dose rate: 1 kGy/s)

图5 K509玻璃发射谱高斯拟合 (总剂量: 1000 kGy)

Fig. 5 Gaussian fitting of emission spectra of K509 glasses (dose: 1000 kGy)

图6 K509玻璃Ce3+的能级图

Fig. 6 Energy level diagram of Ce3+ in K509 glass

图7 不同剂量率辐照后K509吸收变化(总剂量: 1000 kGy)

Fig. 7 Induced absorption spectra of K509 glasses after being irradiated at different dose rates (dose: 1000 kGy)

图8 可见吸收带积分面积与辐照剂量率的关系(总剂量: 1000 kGy)

Fig. 8 Integrated absorption area in visible band as a function of dose rate (dose: 1000 kGy)

图9 不同剂量率辐照后K509激发光谱和发射光谱(总剂量: 1000 kGy)

Fig. 9 Excitation and emission spectra of K509 glasses after being irradiated at different dose rates (dose: 1000 kGy)

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