Optical characteristics of virgin and proton-irradiated ceramics of magnesium aluminate spinel

被引：27

作者：

Feldbach, Eduard ^{[1
]}

Kudryavtseva, Irina ^{[1
]}

Mizohata, Kenichiro ^{[2
]}

Prieditis, Gatis ^{[1
]}

Raisanen, Jyrki ^{[2
]}

Shablonin, Evgeni ^{[1
]}

Lushchik, Aleksandr ^{[1
]}

机构：

[1] Univ Tartu, Inst Phys, W Ostwald Str 1, EE-50411 Tartu, Estonia

[2] Univ Helsinki, Dept Phys, POB 43, Helsinki, Finland

来源：

OPTICAL MATERIALS | 2019年 / 96卷

关键词：

Structural defects; Intrinsic excitations; Cathodo- and photoluminescence; Optical absorption; Proton irradiation; Magnesium aluminate spinel; RADIATION-DAMAGE; ELECTRONIC EXCITATIONS; CATION DISORDER; VACANCY DISTRIBUTION; STRUCTURAL DEFECTS; F+-CENTERS; CRYSTALS; LUMINESCENCE; RESISTANCE; CREATION;

D O I：

10.1016/j.optmat.2019.109308

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Intrinsic properties of optical ceramics of MgAl2O4 have been studied by means of low-temperature cathodo-, photo- and thermo-luminescence methods. Based on the excitation spectra for different emissions measured at 6 K, the UV luminescence at 4.5-5.8 eV is tentatively ascribed to bound excitons (formation energy about 7 eV) near antisite defects (cation in a "wrong" position) and electron-hole recombination in a spinel matrix. The complex UV luminescence band peaked around 5 eV undergoes thermal quenching from 6 to 200 K. The value of energy gap is experimentally estimated as 8.2 eV at 80 K. There is no saturation of the absorption connected with the radiation-induced F-type color centers at the rise of 100-keV proton fluence up to 7 x 10(17) cm(-2), while such irradiation is accompanied by the drastic suppression of cathodoluminescence, especially in UV spectral region. A further study of the origin of this luminescence attenuation still lies ahead.

引用

页数：7