The optical properties and energy-transfer upconversion luminescence of Er3+- and Pr3+/Yb3+-codoped PbGeO3-PbF2-xF2 (x=Mg, Ba) glass and glass-ceramic under infrared excitation at 975 nm is investigated. In Er3+/Yb3+-codoped samples, green (525 and 550 nm) and red (662 nm) luminescence corresponding to the 2H11/2→4I15/2, 4S3/2→4I15/2 e 4F9/2→4I15/2, respectively, was readily observed. In the Pr3+/Yb3+-codoped system, emission peaks around 485, 530, 610, and 645, which were ascribed to the 3P0−3HJ (J=4,5,6) and 3P0−3FJ(J=2,3,4) transitions, respectively, were observed. The population of the praseodymium 3P0 emitting level was accomplished through a combination of ground-state absorption of Yb3+ ions at 2F7/2, energy-transfer Yb3+(2F5/2)−Pr3+(3H4), and excited-state absorption of Pr3+ ions provoking the 1G4−3P0 transition. The dependence of the upconversion emission on glass composition, pump power, and doping contents was also examined. Glassy and glass-ceramic samples were compared in order to determine the system with better luminescence efficiency.