Luminescent Properties of Silver-Activated Magnesium Borate Phosphors

Abstract

Silver-activated magnesium borate phosphors are extremely sensitive to reducing agents in the presence of water or moist air. With progressive reduction, the color of fluorescence turns from bluish white to green, yellow, orange, and red under excitation by 3650A. At the same time the color of the phosphor powders changes from white to gray or black. Similar properties were found in some other crystals containing Ag. The characteristics of these phosphors show some similarities with photographic materials.