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A series of highly Er^(3 )/Yb^(3 ) co-doped fluoroaluminate glasses have been investigated in order to develop a microchip laser at 1.54 μm under 980 nm excitation. Measurements of absorption, emission and up-conversion spectra have been performed to examine the effect of Er^(3 )/Yb^(3 ) concentration quenching on spectroscopic properties. In the glasses with Er^(3 ) concentrations below 10 mol%, concentration quenching is very low and the Er^(3 )/Yb^(3 ) co-doped fluoroaluminate glasses have stronger fluorescence of 1.54 μm due to the ^(4)I_(13/2)--