Luminescence Characteristics of Te- and Bi-Doped Glasses and Glass-Ceramics

Abstract

The luminescence characteristics of Te-and Bi-doped glasses and glass-ceramics were investigated and the origin of coloration and near infrared luminescence was discussed. The colorations of these glasses and glass-ceramics might be due to the elemental clustering, such as Te 2 Te 2 and Bi 2 Bi 2 . The broad near infrared NIR luminescence can be detected in Te-and Bi-doped glasses and glass-ceramics. The electron spin resonance ESR signal at Ŏ ŋ2.0 was observed in Te-and Bi-doped glasses and glass-ceramics, which exhibit NIR luminescence, and therefore this ESR signal is strongly related to the NIR luminescence. The ESR signal at Ŏ ŋ2.0 might be derived from molecular ions of Te and Bi, Te 2 and Bi 2 . Consequently, it is suggested that the broad NIR luminescence of Te-and Bi-doped glass and glass-ceramics are most likely to be caused by elemental clustering, such as Te 2 Te 2 and Bi 2 Bi 2 .

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.…”

“…This could replace or complement the erbium doped fiber amplifier (EDFA), which is currently used in fibre optic networks but is limited by its relatively narrow gain bandwidth. The origin of the infrared emission from Bi doped glasses remains controversial and has been attributed to Bi + [8], Bi 5+ [9,10], Bi metal clusters [6] and negative charged Bi 2 dimers [11,12]. Although there are numerous reports of Bi emission from traditional glasses we are only aware of one report of emission from a chalcogenide (GeS 2 -Ga 2 S 3 ) [13].…”

Luminescence from bismuth-germanate glasses and its manipulation through oxidants

“…In principle, a large number of species is possible, ranging from Bi 3+ as the predominant species in common applications to lower redox states such as Bi + and Bi 2+ [2,[7][8][9], or higher oxidized species such as Bi 5+ [10]. In addition, various subvalent species and ion clusters [11][12][13], Bi 0 or metallic bismuth particles have been reported. The question as to which species are dominant in a given material has significant consequences for the material's optical properties, which makes it crucial to delicately control the redox conditions [14].…”

On the near-infrared luminescence from TeO2 containing borate glasses

“…4) Zinc tellurium phosphate glass (ZTP) appeared to be brilliant purple and many small particles were observed by scanning electron microscope (SEM) observation in this glass. 6) These particles were confirmed to be Te-metallic colloids and the strong absorption at around 537 nm was derived from the surface plasmon resonance absorption of Te-metallic colloids. 4) This glass contained the same amount of TeO2 (10 mol%) as that in borate glasses and was melted at nearly the same temperature (1200°C-2 h).…”