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How do LEDs work
How do LEDs work
Date:2019-07-30    View:57
To clarify the working principle of the LED lamp, first of all, a simple understanding of the LED:



LED (Light Emitting Diode), a light emitting diode, is a solid-state semiconductor device that can directly convert electricity into light. The heart of the LED is a semiconductor wafer. One end of the wafer is attached to a bracket, one end is negative, the other end is connected to the positive pole of the power supply, so that the whole wafer is encapsulated by epoxy resin. Semiconductor wafers are made up of three parts, one is P-type semiconductor, in which holes dominate, and the other end is N-type semiconductor, where electrons are the main part, and quantum wells of 1 to 5 cycles are usually in the middle. When the current acts on the wafer through a wire, electrons and holes are pushed into a vector sub-well, in which electrons recombine with holes and then emit energy in the form of photons, which is the principle of LED luminescence. The wavelength of light, the color of light, is determined by the material that forms the P-N junction.



LED characteristics:



Compared with incandescent bulbs and neon lamps, the characteristics of light emitting diodes are as follows: low working voltage (some only a few volts); low working current (some only a few milliamperes can emit light); good shock resistance and shock resistance, high reliability and long life; and the intensity of light emitting can be conveniently modulated by modulating the passing current. Weak. Because of these characteristics, light-emitting diodes are used as light sources in some photoelectric control devices and signal displays in many electronic devices. The core of the tube is made into strips. Seven pieces of semiconductor digital tubes are made up of seven strips of light emitting tubes. Each digital tube can display 0-9, 10 Arabic numerals and some letters of A, B, C, D, E, F, etc. (It must be case-sensitive).
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