Abstract
ZnO powders were obtained by proteic sol–gel process using zinc sulfate as the precursor. They have an energy gap of 3.3 eV and display a radioluminescence signal centered in 550 nm, which corresponds to 2.6 eV. This signal has appeared due to defects in the gap (energy sublevels) caused by the distortions in its crystalline structure, which result from the loss of sulfur at high temperature. These powders were characterized by radioluminescence, XRD, SEM, EDS and DTA/TG.
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