Emission enhancement at 2.7 mm is observed in Er3+/Pr3+-codoped germanate glasses when pumped by a 980-nm laser diode. Significant reductions in 1.5-mm emission and upconversion intensity indicate efficient energy transfer between Er3+ and Pr3+; the energy transfer efficiency is as high as 77.4%. The mechanisms of energy transfer are discussed in detail. The calculated emission cross-section of Er3+/Pr3+-codoped germanate glass is 8.44×10-21 cm2, which suggests that Er3+/Pr3+-codoped germanate glass can be used to achieve efficient 2.7-mm emission.