The principle of luminous signs shine

Luminous signs the luminous principle of luminous signs luminescence principle: is using the fluorescent powder ( Commonly known as noctilucent powder) , usually divided into light energy storage luminous powder and radioactive noctilucent powder. Light energy storage luminous powder is phosphor under natural light, solar lights, such as ultraviolet irradiation, the light energy stored, after the stop light, in slowly released in the form of fluorescence, so at night or dark place, still can see light, duration lasted for several hours to ten hours. Radioactive noctilucent powder is mixed with radioactive material in the fluorescent powder, using the rays from radioactive substances continuously stimulate phosphor luminescence, this kind of luminous powder luminescent time is very long, but the poisonous and harmful and small environmental pollution and so on application range. People in real life noctilucent powder using light-emitting characteristics, for a long time made weak lighting light source, in military departments have special use, spread the material on the aircraft instruments, clocks, Windows, machine all kinds of switches, panels, the place such as door handle, can also be used with all kinds of transparent plastic pressed into various symbols, parts, supplies, Such as the power switch, socket, fish hook, etc. ) 。 These luminous components after light, or unexpected power outage at night and get up after the lightning it continues to shine, make people can identify direction around, bring convenience for work and life. The luminous material ultrafine particle mixed with textile, make the color more bright-coloured, children put on a luminous fabrics, can reduce the number of traffic accidents. Luminous materials at home and abroad mainly ZnS, administered SrS and CaS, made of green and yellow. SrS, CaS material easy deliquescence, brings to the wide application of difficulties. So the market mainly ZnS is administered matrix of luminescent materials. But its afterglow time only 1 ~ 3 hours, at the same time in the bright light, Like the sun) Black is apt to deteriorate, ultraviolet light and moisture in the air, so the application is restricted in many fields. Add drill, copper activation of ZnS luminescent powder administered despite long afterglow time, but it has the infrared quenching phenomenon, in DianDengGuang ( Contains more red light) , afterglow out soon.