NEAR INFRARED LUMINESCENCE FROM BI-DOPED SODA-LIME-SILICATE GLASSES
Keywords:
Bismuth cluster, soda-lime-silicate glass, absorption spectra, near infrared luminescence (NIR), electron spin resonance (ESR)Abstract
The effect of melting atmosphere on the luminescent characteristics of Bi-doped soda-lime-silicate glasses was investigated, and the origin of NIR luminescence was also discussed. The appearance of these glasses changed from colorless and transparent to deep brown depending on the melting atmosphere (amount of carbon addition). The characteristic absorption bands can not be observed in all glasses. The colorless and transparent glass (C1.50) exhibit both UV-VIS and NIR luminescence. The UV-VIS luminescence comes from Bi³⁺ ion, which remains in glasses. On the contrary, the NIR luminescence is derived from Bi clustering, such as Bi₂ or Bi₂⁻, and therefore transparent colorless C1.5 glass contains both Bi³⁺ ion and Bi₂ or Bi₂⁻. The ESR measurements confirmed that the ESR signals derived from molecular clustering of Bi, Bi₂⁻ can be detected at g~2.0. Consequently, it is found that the molecular clustering of Bi, Bi₂ or Bi₂⁻, might be produced under the mild reducing condition.
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