The near-infrared broadband emission from bismuth-doped GeO2-WO3 and GeO2-BaO glasses

摘要

Glasses with the composition of (99.5- chi)GeO2-chi WO3-0.5Bi(2)O(3) (chi= 3, 6,9 mol%) and (99.5 psi)GeO2-psi BaO-0.5Bi(2)O(3) (psi =3, 6, 9 mol%) were prepared. Their thermal, emission and absorption measurements were carried out. The near-infrared super broadband emission of the prepared samples peak around 1.3 mu m was discovered. The results indicated, in GeO2-WO3-Bi2O3 glasses, increasing amount of WO3 brought about the broadening of FWHM, prolonging of lifetime and enhancing of thermal stabilities. While in GeO2-BaO-Bi2O3 glasses, concomitant with the increasing amount of BaO were the broadened FWHM as well as the prolonged lifetime. Red-shift tendency of absorption edges was discovered in both two groups of glasses indicating the Bi5+ ions might take responsibility for the broadband emission. (C) 2007 Elsevier B.V. All rights reserved.