Up-conversion luminescence in low phonon heavy metal oxide glass co-doped with Er3+/Ho3+

T. Ragiń, A. Baranowska, M. Sołtys, A. Górny, J. Zmojda, M. Kochanowicz, P. Mikulski, R. Jadach, D. Dorosz

Abstract


In this paper, heavy metal oxide glasses co-doped with erbium and holmium ions have been synthesized. Glass composition, based on the bismuth and germanium oxides, has been selected in terms of high thermal stability (delta T = 125 °C), high refractive index (n = 2.19) and low maximum phonon energy (hvmax = 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.

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Photonics Letters of Poland - A Publication of the Photonics Society of Poland
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