Interstitial bismuth dimers and single atoms as possible centres of broadband near-IR luminescence in bismuth-doped glasses

Abstract

Absorption, luminescence and Raman spectra of interstitial bismuth atoms, ${\mathrm{Bi}}^0$, and negatively charged dimers, ${\mathrm{Bi}}^{2-}$, in alumosilicate, germanosilicate, phosphosilicate and phosphogermanate glasses networks are calculated by time-dependent density functional method. On grounds of this calculation an extension of our previously suggested model of broadband near-IR luminescence in bismuth-doped glasses is put forward.

14 pages, 5 figures, 1 table