Fifty years ago,the huminality had already known the basick nowledge Of semicon ductor materials can produce light.The first commercial Diode produced in1960.LED is short forlight emitting diode(LED),its Basic structure is an electroluminescent semicon ductor materials,placed On the a stand with down-lead,and then sealed with epoxy resin around In order to protect internal batteries,so the aseismatic capablity of LED is good.
The advantages of LED illumination
1.Security:LED issupplied by low-voltage power,so it is safer than Supplied by high voltage power,it is particularly applicable to public.
2.Economy:compared with the incandescence lamp the energy Consumption reduces 80%.
3.Applicability:convenient apply,each unit of LED snippet is3-5mm square,it can be prepared into various shaped devices,and suitable for The in constant environment.
4.Stability:it can work 100,000 hours,the light decay is 50 percent of the initial.
5.Responsetime: fincandescence lamp sbase on millisecond,theLED Base on nanosecond
6, Environmental protection: no harmful metal mercury
7.Color:changing the electric current can change the color,the light-emitting diode easily adjust the energy band structure and the Band gap through chemical modification, adjustment of the energy band Structure and the band gap and achieve multi color luminescence.For example,with small current atthe LED is in red,but with the current increases,it will turn into orange,yellow,and green finally.
8.Life-span:the expect ancy of LED is more than incandescence lamp,it Is more than ten times as an ordinary incandescence lamp.