What is the working principle of LED ?

        When night falls, in large and small cities and towns in all kinds of LED lights will light up, such as LED signs, LED lights and so on. Some of them are square panel light, some circular panel light. Our world becomes colorful LED because it has become an indispensable part of our lives, What is the working principle of LED? Here source crystal small for you to brief you.
        LED stands for light-emitting diode is called, it belongs to a semiconductor diode. Therefore, ordinary diodes and LED, is composed of a PN junction, and having unidirectional. PN junction is of a P-type semiconductor and an N-type semiconductor thereof. When coupled to the LED forward voltage, the holes injected into the area from the P and N zone area by the N P injected into the area of electronic, electrical and P empty area near the PN junction within a few microns, respectively, and N region cave complex, resulting in the spontaneous emission of fluorescence. In which the energy state of electrons and holes of different type of semiconductor material. When electrons and holes recombine different amount of energy released, the more the energy released, the shorter the wavelength of the light emitted.
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