Near-IR emission of Er3+ ions in CsCI-Ga-Ge-S glasses excited by visible light

Fluorescence of 65CeS(2)-25Ga(2)S(3)-10CsCl glasses doped with Er has been investigated at room and liquid nitrogen temperatures. Strong emission lines at similar to 1 and similar to 1.5 mu m are observed at room temperature in Er doped samples when excited with similar to 530 nm wavelength. At cryogenic temperature, this fluorescence is observed even at lower excitation wavelengths (similar to 400-450 nm). The other observed emission and absorption lines agree well with known energy level transitions of Er3+ ions incorporated in the glass matrix and temperature behavior of absorption spectra. The difference between room and liquid nitrogen temperature up-conversion emission is observed under femtosecond pulsed 800 nm laser excitation. (C) 2017 Elsevier B.V. All rights reserved.