Er3+ to Eu3+ energy-transfer and frequency upconversion in PbGeO3: PbF2: CdF2 glass are reported. Emission spectra excited at 980 nm was obtained for Er3+-doped samples, while Eu3+ emissions only occurred for double-doped (Er3+/Eu3+) or triple-doped (Yb3+/Er3+/Eu3+) samples. Codoped samples' spectra exhibit bands around 520 (H-2(11/2) - I-4(15/2)), 545 (S-4(3/2) - I-4(15/2)), 590 (D-5(0) - F-7(1)), 610 (D-5(0) - F-7(2)), 660 (F-4(9/2) - I-4(15/2)) and 700 (D-5(0) - F-7(4)) nm. The Er3+ green emissions' lifetimes were examined as a function of Eu3+ content evidencing Er3+-to-Eu3+ energy-transfer. The addition of Yb3+ enhanced the Eu3+ ions' emissions suggesting potential application for upconversion-based white light phosphor. (C) 2018 Elsevier B. V. All rights reserved.