First-principle study of the near-IR luminescence centers in Bi2O3-GeO2 andBi2O3-SiO2 glasses

Original · EN

First-principle study of bismuth-related oxygen-deficient centers (=Bi≡, =Bi≡, and =Bi= oxygen vacancies) in Bi₂O₃-GeO₂, Bi₂O₃-SiO₂, Bi₂O₃-Al₂O₃-GeO₂, and Bi₂O₃-Al₂O₃-SiO₂ hosts is performed. A comparison of calculated spectral properties of the centers with the experimental data on luminescence emission and excitation spectra suggests that luminescence in the 1.2-1.3 μm and 1.8-3.0 μm ranges in Bi₂O₃-GeO₂ glasses and crystals is likely caused by =Bi≡ and =Bi= centers, respectively, and the luminescence near 1.1 μm in Bi₂O₃-Al₂O₃-GeO₂ glasses and crystals may be caused by =Bi≡ center with (AlO₄)- center in the second coordination shell of Ge atom.