T Ragiń, A Baranowska, M Sołtys, A Górny, J Zmojda… – Photonics Letters of Poland, 2018
Abstract
In this paper, heavy metal oxide glasses co-doped with erbium and holmium ions have been synthesized. Glass composition, based on bismuth and germanium oxides, has been selected in terms of high thermal stability (∆T = 125 °C), high refractive index (n = 2.19) and low maximum phonon energy (hνmax = 724 cm-1). Up-conversion luminescence spectra under the 980 nm laser diode excitation have been observed as a result of radiative transitions within the quantum energy level structures of Er3+ and Ho3+ ions. Optimization of rare earth ions content has been conducted, the highest emission intensity in the visible wavelength range has been observed in glass co-doped with molar concentration 0.5 Er2O3 / 0.5 Ho2O3.
… The absorption spectra in a spectral range of 460÷1000nm were obtained using a Stellarnet Green-Wave Spectrometer as well as the luminescence spectra using a high power laser diode (λexc=980nm) as a pump source …
