Abstract
The Bi–Tm–Er co-doped SiO2–Al2O3–La2O3 (SAL) glasses, which exhibited a broadband near-infrared (NIR) emission, were investigated by the optical absorption and photoluminescence spectra. A super broadband NIR emission extending from 0.95 to 1.6μm with a full-width at half-maximum (FWHM) of 430nm which covered the whole O, E, S, C and L bands, was observed in Bi–Tm–Er co-doped samples under 808nm excitation, as a result of the overlap of the Bi-related emission band (centered at 1270nm) and the emission from Tm3+3H4→3F4 transition (1450nm) as well as Er3+4I13/2→4I15/2 transition (1545nm). In addition, a super broadband emission with amplitude relatively flat from 0.95 to 2.1μm has been observed. The possible energy transfer between Bi-related centers, Tm3+ ions and Er3+ ions was proposed.
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