What is the luminous principle of phosphor?
Phosphor, commonly known as luminous powder, glows in dark, usually refers to luminous energy storage luminous powder, which stores the light energy after being irradiated by natural light, sunlight, ultraviolet light, etc., and then slowly releases it in the form of fluorescence after stopping the light irradiation, so that the light can still be seen at night or in the dark, lasting for several hours to more than ten hours.
The phosphor itself is not radioactive. Luminescent powder with radioactivity is a kind of luminescent powder which is mixed with radioactive materials and excited by the continuous emission of radioactive materials. The luminescent time of this kind of luminescent powder is very long, but because of toxic and harmful and environmental pollution, so the application scope is small.
What is the physical principle of phosphor luminescence?
Compared with thermal radiation, fluorescence is a process of producing light with little heat. Appropriate materials absorb high-energy radiation and then emit light, the energy of which is lower than that of excitation radiation. When the luminescent material is solid, it is usually called phosphor. The high energy radiation of excited phosphors can be electrons or ions with high velocity, or photons from gamma ray to visible light.
Phosphors are widely used. In real life, people make use of luminous powder's long-time luminous characteristics to make weak lighting source. This kind of material can be applied to various switch signs and door handles on aviation instruments, clocks, windows and machines, and can also be pressed into various symbols, parts and supplies (such as power switch, socket, fishing hook, etc.) with various transparent plastics. After being illuminated by light, these light-emitting parts still emit light continuously, so that people can distinguish the surrounding direction and bring convenience to work and life. The ultra-fine particles of luminous materials are mixed into textiles to make the colors more bright. Children can reduce traffic accidents by wearing luminous textiles.