The principle and characteristics of the infrared light emitting diode

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Light is an electromagnetic  wave, its wavelength range from several nanometers(1nm=10-9m) to 1 mm (about mm). Visible only a part of them, which we call visible light, range of visible light wavelength is 380nm ~ 780nm, visible from long to short wavelength is divided into red, orange, yellow, green, cyan, blue, purple, violet  wave length than known as the short wavelength ultraviolet light, longer than infrared light is called infrared light.Spectral characteristics of ordinary black and white CCD camera can feel the light, it can not only feel the visible light, and the infrared light can be felt. This is the use of CCD camera, the basic principle of  CCD camera can be more economical to achieve the vision cooperation with the ir infrared light .  The  Instead of spectral characteristics of ordinary color camera can’t feel infrared light, and therefore can not be used for night vision.Infrared led  divide into  semiconductor solid light (infrared emission tubes) infrared light and heat radiation of infraredd light，according to the infrared radiation mechanism .
Its principle and characteristics are as follows:
Theory and the characteristics of  infrared emitting diode (LED)Infrared light emitting diode array is composed of two  the luminous components .The infrared emission level two tube infrared radiation from the high efficiency ofmaterial (often made of PN junction GaAs GaAs), empty the forward bias injection current into the PN junction and infrared light of excitation. The central wavelength of spectral power distribution as 830 ~ 950nm,the bandwidth of  half peak as about 40nm, it is a narrowband distributed, just  the CCD  camera can feel range. Its biggest advantage is completely without red storm, (with 940nm ir led ~ 950nm wavelength infrared tube) or only has faint red storm (red storm for visible light) and long life.