PHOSPHOR, PROCESS FOR PRODUCING PHOSPHOR AND LUMINESCENT DEVICE

摘要

There is provided a manganese-activated zinc silicate phosphor comprised of particles of 1.0 to 1.4 major axis to minor axis ratio. Further, there is provided a process for producing the phosphor, comprising the step of heating and firing phosphor raw materials containing elements constituting a phosphor matrix and an activator or a compound containing the elements in a heating oven while effecting flow or rotation thereof so as to obtain manganese-activated zinc silicate phosphor particles of 1.0 to 1.4 major axis to minor axis ratio. There is provided another process for producing the phosphor, comprising the step of heating and firing phosphor raw materials in a heating oven while effecting flow or rotation thereof so as to obtain a manganese-activated zinc silicate phosphor of < 9 ms persistence time. Thus, a compact phosphor layer with high packing density can be formed, and there can be obtained a phosphor capable of high-brilliance green light emission upon excitation by vacuum ultraviolet rays or low-voltage electron beams. Moreover, there can be obtained a manganese-activated zinc silicate phosphor capable of emission of green light of high brilliance and short persistence time upon excitation by vacuum ultraviolet rays or low-voltage electron beams.