Spectroscopic properties of Er3+-doped and Er3+/Yb3+-codoped PbF2–MOx (M = Te, Ge, B) oxyfluoride glasses

Abstract A series of Er 3+ -doped and Er 3+ /Yb 3+ -codoped lead germanate (GP), lead tellurite (TP) and lead borate (BP) transparent oxyfluoride glasses were synthesized. Spectroscopic characteristics of these materials were systemically measured. The Judd–Ofelt parameters were calculated according to absorption spectra. F − ions have a strong effect on refractive index ( n ) and phonon energy of the host. Intense red and green upconversion is closely related to phonon energy, J–O parameters and sensitizer. The GPEY-2 glass (53GeO 2 –43PbF 2 –0.5Er 2 O 3 –2Yb 2 O 3 ) shows good transparency and fairly strong upconversion emissions.

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