Explanation

That is, luminescence after excitation stops. Some luminescence materials, such as ZnS: Cu, can emit luminescence for a long time, up to several hours, after being exposed to ultraviolet and even sunlight. These materials are called long luminescence materials. The length of afterglow is very important for cathode ray luminescent powder, and the time when it decays to 10% of the initial brightness is often called time. Time less than l μ S is called ultra short, 1-10 μ The distance between s is called short, 10 μ The values between s-lms are called medium short, those between 1-100ms are called medium, those between 100ms and 1s are called long, and those greater than ls are called extremely long. The phosphor for TV should be medium, the phosphor for radar should be long or extremely long, and the one for flying spot scanning tube should be ultra short. ② After the materials is ignited and leaves the ignition source, the glow solid phase combustion maintained by materials is sometimes called after glow.

Classification