Abstract
We report the results of our investigation on the optical properties of the bismuth borate glass (75B2O3-25Bi2O3). Unusual near-infrared (NIR) and visible band luminescence was observed when the sample was excited by lasers working at 532 and 808 nm. The NIR fluorescent lifetime of the sample measured at room-temperature was longer than two hundred microseconds. This indicated that this glass system could be a new candidate for the broadband optical amplification and laser material covering the wavelength from 1100 to 1300 nm. The influences of preparation conditions and glass compositions on the luminescence properties of glasses were investigated. It was found that the heat-treatment under air and hydrogen atmosphere can both weaken the infrared luminescence of the materials. Furthermore, with the addition of oxidation agent CeO2, the sample did not show any NIR luminescence upon the excitation of the lasers working at 532 or 808 nm. All the results indicated that the infrared luminescence center should be Bi+ ions.
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