The Er3+-Yb3+ co-doped silicate glasses have been prepared and the temperature dependence of the fluorescence intensity ratio (FIR) of the green up-conversion emissions about 526 nm and 549 nm in the range of 296-723 K is investigated. The maximum sensitivity and the temperature resolution derived from the FIR technique of the green up-conversion emissions are approximately 0.0033 K-1 and 0.2 K, respectively. The results imply that Er3+-Yb3+ co-doped silicate glass can play an important role in high temperature measurement. (c) 2007 Elsevier B.V. All rights reserved.