Near-infrared broadband luminescence in Bi2O3-GeO2 binary glass system

Abstract

Near-infrared broadband luminescence from 1100 to 1600 nm was observed in Bi 2 O 3 -GeO 2 binary glasses. The strongest emission can be observed with 30 mol % Bi 2 O 3 when pumped at 808 nm. The lifetimes of all samples are longer than 200 μs. The glass network was studied by Raman spectra and Bi + ions are proposed as the infrared luminescence centers in this glass system. Thermal treatment in air results in partly oxidation of Bi + to Bi 2+ .