Fluorindate glasses containing 1,2,3,4 ErF 3 mol % were prepared in a dry box under argon atmosphere. Absorption, Stokes luminescence ͑under visible and infrared excitation͒, the dependence of 4 S 3/2 , 4 I 11/2 , and 4 I 13/2 lifetimes with Er concentration, and upconversion under Ti-saphire laser excitation at ϭ790 nm were measured, mostly at Tϭ77 and 300 K. The upconversion results in a strong green emission and weaker blue and red emissions whose intensity obeys a power-law behavior Iϳ P n , where P is the infrared excitation power and nϭ1.6, 2.1, and 2.9 for the red, green, and blue emissions, respectively. The red emission exponent nϭ1.5 can be explained by a cross relaxation process. The green and blue emissions are due to excited state absorption ͑ESA͒ and energy transfer ͑ET͒ processes that predict a factor nϭ2 and nϭ3 for the green and blue emissions, respectively. From transient measurements we concluded that for lightly doped samples the green upconverted emission is originated due to both processes ESA and ET. However, for heavily doped samples ET is the dominant process.