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Why do light-emitting diodes glow

Release time

2022-11-29

Light-emitting diode it is a solid electroluminescent semiconductor device that converts electrical energy into light energy, the core part of the light-emitting diode is composed of p-type semiconductor and n-type semiconductor wafer, there is a transition layer between the p-type semiconductor and n-type semiconductor, called the p-n junction. It is mainly by the bracket, silver glue, wafer, gold wire, epoxy resin five parts are composed of.

1, light-emitting principle. Understanding how LED light before, first to understand what is the principle of electroluminescence, which is due to the electric field excitation of electrons from the low-energy state jump to the high-energy state, when these electrons from the high-energy state back to the low-energy state, according to conservation of energy, the excess energy will be released in the form of light, which then produces luminescence, therefore, LED light is essentially due to the leap of electrons, that is, electrons and valence Band holes on the composite, the composite energy obtained in the form of photons is convenient.

2, luminous color. Then how LED emits different colors, we know that each kind of light will have a wavelength, red light-emitting diode wavelength is generally 620-630NM, orange light-emitting diode wavelength is generally 600-610NM, yellow light-emitting diode wavelength is generally 585-595NM, green light-emitting diode wavelength is generally 520-530NM. and LED light-emitting The wavelength of the LED depends on the width of the material PN junction, according to the PN junction is different, LED can emit different colors of light, we are more common is red, yellow, green, blue four colors.

led lamp beads

Is a light-emitting diode a semiconductor?

led lamp beads

Is a light-emitting diode a semiconductor?