The paper dealt with the study of fluorescence properties of sol-gel systems doped with rare-earth ions and co-doped with silver.The general problem for these types of inorganic phosphors was a very low absorbance in the visible range.Therefore,a sensitizer of luminescence of the rare-earth ions should be selected and used.The sensitizer should possess a good absorbance in the visible range and strong interaction with the rare-earth ions.In this study silver ions were selected as the sensitizer.