The 2.7 mu m emission has been obtained using 980 nm laser excitation in Er3+/Tm3+/Pr3+ triply doped ZrF4-BaF2-LaF3-AlF3-YF3 glass. 2.7 mu m emission characteristics and energy transfer are investigated. Population inversion between the I-4(11/2) and I-4(13/2) levels is significantly enhanced by way of Tm3+ and Pr3+ co-doping into Er3+-doped fluoride glass. These results indicate that this Er3+/Tm3+/Pr3+ triply doped fluoride glass has potential applications in 2.7 mu m laser.