Centres of broadband near-IR luminescence in bismuth-doped glasses

Abstract

Interstitial negative-charged bismuth dimers, and , are suggested as a model of broadband near-IR luminescence centres in bismuth-doped glasses. The model is based on quantum-chemical calculations of equilibrium configurations, absorption, luminescence and luminescence excitation spectra of the dimers in an alumosilicate network and is supported by IR and visible luminescence observed for the first time in bismuth-doped polycrystalline magnesium cordierite and by Raman spectra measurements in optical fibres with bismuth-doped alumosilicate glass core.

Spectroscopy of bismuth-doped lead–aluminum–germanate glass and yttrium–aluminum–silicate glass

“…Other authors have argued that the origin of absorption and emission in Bi-doped glasses is Bi 2 dimers. This was based on electron spin resonance (ESR) measurements [22] and modeling of energy levels [23,24]. Our results, along with those of Denker, support these arguments.…”

“…In Bi-doped glasses near infrared emission has often been observed, however there is a lot of uncertainty as to the oxidation state of bismuth in glasses, and most of the oxidation state assignments were made tentatively. The near infrared emission of bismuth-doped glasses has been attributed to Bi + [18], Bi 5+ [1,21], Bi metal clusters [15], and negatively charged Bi 2 dimers [12,[22][23][24].…”

Ultrabroad emission from a bismuth doped chalcogenide glass

“…A quadratic dependence of absorption strength on Bi concentration has also been suggested as evidence for Bi 2 dimers [39,40]. Other evidence for Bi 2 dimers includes electron spin resonance (ESR) measurements of Bi doped silicate glass and glass-ceramics which showed similarities to ESR spectra of other dimer molecules [11] and modeling of energy levels [12,41]. The observation in this work of Bi emission in Bi:GLS, which has a very low oxygen content, and in a non-oxygen containing chalcogenide glass [13] detracts from BiO being the origin of emission.…”

Near infrared photoluminescence of the univalent bismuth impurity center in leucite and pollucite crystal hosts

“…The Bi 3+ ion in the common oxidation state +3 has no optical transitions in NIR and the observed emission was attributed to possible Bi 5+ , 1 Bi 2+ , 20 Bi + , 21 Bi 0 , 8,9,22 Bi 2 À , Bi 2 2À , 23 and bismuth cluster species. 24 The related information was also summarized in the recent review.…”