Near-infrared to mid-infrared photoluminescence of Bi_2O_3-GeO_2 binary glasses

Abstract

Near-infrared and mid-infrared (MIR) ultrabroad emission bands were observed in as-grown and annealed Bi(2)O(3)-GeO(2) binary glasses, in the wavelength ranges of 1000-1800 nm and 1800-3020 nm, respectively. The MIR emission band could appear through high doping ratio of Bi(2)O(3) or annealing process in air atmosphere. The structure of these glasses, the transformation of emission centers, and the effect of Al ions doping have been discussed, with the conclusion that the Bi(2)O(3)-GeO(2) binary glasses could be a promising laser material.

Origin of near-IR luminescence in Bi_2O_3–GeO_2 and Bi_2O_3–SiO_2 glasses: first-principle study

“…Suggesting the migration energies of O vacancy between various pairs of atoms to be approximately in the same relations as formation energies of corresponding vacancies, one can explain the results of [14] by thermally stimulated migration of O vacancies during glass annealing. Owing to the migration, = Bi · · · Ge ≡ centers may transform into = Bi · · · Bi = ones.…”

“…In binary Bi 2 O 3 -GeO 2 systems, however, distinctly different luminescence occurs. The luminescence in the 1.2-1.3 µm range excited at 0.5, 0.8 and 1.0 µm was observed in [12][13][14][15] and x ≈ 0.01 [16] [15]. Annealing glasses in oxidative atmosphere [12][13][14][15] or adding oxidant (CeO 2 ) in glass [19] led to a decrease in the luminescence intensity evidencing convincingly oxygen-deficient character of the luminescence centers.…”

“…The luminescence in the 1.2-1.3 µm range excited at 0.5, 0.8 and 1.0 µm was observed in [12][13][14][15] and x ≈ 0.01 [16] [15]. Annealing glasses in oxidative atmosphere [12][13][14][15] or adding oxidant (CeO 2 ) in glass [19] led to a decrease in the luminescence intensity evidencing convincingly oxygen-deficient character of the luminescence centers. In Bi 2 O 3 -Al 2 O 3 -GeO 2 glasses [20,21], in Bi 2 O 3 -GeO 2 glass prepared in alumina crucible [16] 2 and SiO 2 (namely, O vacancy and twofold coordinated Si or Ge atoms), but as well similar ODCs containing Bi atoms (BiODCs), namely, = Bi · · · Ge ≡, = Bi · · · Si ≡, = Bi · · · Bi = vacancies and twofold coordi-nated Bi atoms.…”

Nonlinear optical properties of Bi2O3-GeO2 glass at 800 and 532 nm

“…Among the HMO glasses of interest Bi 2 O 3 -GeO 2 glass (labeled as BGO glass) was characterized with respect to its properties of photoluminescence (PL), [16][17][18][19][20][21][22] optical amplification, and stimulated Raman. [20][21][22] The synthesis of this glass is simple and the results in the literature [16][17][18][19][20][21][22] indicate that BGO glass is a good choice for photonic applications.…”

“…[20][21][22] The synthesis of this glass is simple and the results in the literature [16][17][18][19][20][21][22] indicate that BGO glass is a good choice for photonic applications. Moreover, with basis on published results for the several materials containing Bi 2 O 3 , we expect that BGO glass can also be used for NL photonics.…”