Low-energy-electron-exciting fluorescent display device

摘要

A red emission fluorescent display device employing improved SnO2:Eu phosphor as a low-energy-electron excitation phosphor. The phosphor is manufactured by the following steps: To a starting material selected from the group consisting of at least one of metallic tin, stannous and stannic halide and stannous sulfate, europium oxide is added in the amount of 5x10-2 to 10 atomic % europium to tin. The mixture is heated and stirred with nitric acid until it becomes dry due to evaporation of the solvent water and unreacted nitric acid, thereby forming a mixed powder of metastannic acid and europium. Then the powder is subjected to heat treatment, causing the metastannic acid to thermally decompose and the europium to diffuse into the stannic oxide matrix. The device exhibts remarkably high luminescence intensity and it is possible to achieve the intensity of 26f.L or more under the Eb of 10 V and the Ib of 1.5 mA/cm2.