afterglow and infrared

Luminescence materials both at home and abroad mainly zinc sulfide, SRS cas, luminous ceramic light green and yellow. SrS, CaS the deliquescence of materials, difficulty in widespread application. So the main ZnS luminescent material administered on the market as the base photoluminescent pigment. Persistence, but it is only 1 to 3 hours, and the light (the sun), ultraviolet light and black perishable wet air, so that in many applications is restricted. Adding cobalt and copper activation of ZnS luminescent administered with long afterglow, the photoluminescent pigments quenching with infrared phenomenon, luminous aluminum light (including red) radiation, afterglow quickly extinguished.