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

Bi‐Doped Glass for Photonic Devices

“…Sokolov et al . carried out the first principle study of bismuth‐related oxygen‐deficient centers (=Bi · · ·Ge≡, =Bi · · ·Si≡, and =Bi · · ·Bi= oxygen vacancies) in Bi 2 O 3 –GeO 2 , Bi 2 O 3 –SiO 2 , Bi 2 O 3 –Al 2 O 3 –GeO 2 , and Bi 2 O 3 –Al 2 O 3 –SiO 2 hosts . A comparison of the calculation results with the experimental emission and excitation spectra of NIR emission suggests that luminescence in the 1.2–1.3 μm and 1.8–3.0 μm ranges in Bi 2 O 3 –GeO 2 glasses and crystals is likely caused by =Bi · · ·Ge≡ and =Bi · · ·Bi= centers, respectively.…”

Crystallization of GeO2–Al2O3–Bi2O3 Glass

“…As a consequence, oxygen vacancies are created in the glass. It is also known that both rare earth metals, i.e., Ho, Tm, Yb [9], Nd [16], Ce [17], and Er [18] and the transition metals, such as Mn [13], Cr [12], and Bi [19,[19][20][21][22], have been used as activators for the GeO 2 glass-like matrix. Above all, bismuth especially plays an extraordinary role because it causes an IR emission in the glass-like matrix.…”

Synthesis, Structural and Optical Properties of Bismuth‐Doped Sol‐Gel‐Derived Phosphosilicate Glasses

“…Moreover, due to the dependence of the optical activity on bismuth valence state, the incorporation and the preservation of optically active bismuth centers into silica‐based optical fibers constitute an actual challenge in materials science. Since then, research attention is focused on the investigation related to the luminescence properties of Bi‐doped glasses, which provides information on the nature of the Bi active NIR‐luminescent center (BAC) . That is why the development of materials containing a single optical center is crucial to study the origin of the NIR PL in Bi‐doped silica glasses without complications related to overlapping of absorption and PL bands and/or interaction between different optical centers .…”

“…Since then, research attention is focused on the investigation related to the luminescence properties of Bi-doped glasses, which provides information on the nature of the Bi active NIR-luminescent center (BAC). [10][11][12] That is why the development of materials containing a single optical center is crucial to study the origin of the NIR PL in Bidoped silica glasses without complications related to overlapping of absorption and PL bands and/or interaction between different optical centers. [13][14][15] However, the Biactivated glasses have been widely prepared using melt-quenching or modified chemical vapor deposition (MCVD) methods, that led to multicomponents glasses containing multiple optical BACs.…”