Dependence of spectroscopic properties on doping content and temperature of bismuth-doped lanthanum aluminosilicate glass

Abstract

The effects of bismuth doping content and temperature on the absorption property and near-infrared (NIR) luminescence of Bi-doped La 2 O 3 -Al 2 O 3 - SiO 2 (LAS) glasses are presented. The emission intensity reaches the maximum when the Bi 2 O 3 content in 3.0Bi-LAS is 1.83%. The emission spectra reach their peaks at 1190 and 1117 nm, with full-width at half-maximum (FWHM) values of 330 and 228 nm under 500 and 700-nm excitations, respectively. As the Bi 2 O 3 content increases, the peak wavelengths and FWHMs of emission bands increase, but their lifetimes decrease. The lifetime of 2.0Bi-LAS is 460 μs at 9 K, and is almost temperature independent until 350 K. The NIR emission of Bi in the system has strong resistance to thermal quenching from 9 to 350 K. © 2012 Chinese Optics Letters.