What does SMD LED mean?Posted by crescentled on February 6th, 2019 SMD LED means surface mounted light emitting diode. SMD patch is helpful to improve production efficiency and application of different facilities. It is a solid semiconductor device that can directly convert electricity into light with a voltage from 1.9 to 3.2 and the red and yellow light requires the lowest voltage. The heart of the LED is a semiconductor chip. One end of the chip is attached to a bracket, which is a negative electrode, and the other end is connected to the positive electrode of the power supply, so that the whole chip is encapsulated by epoxy resin. A semiconductor chip consists of two parts, one is a P - type semiconductor in which holes predominate, and the other is an N - type semiconductor in which electrons predominate. However, when the two semiconductors are connected, a P-N junction is formed between them. When a current is applied to the chip through a wire, electrons will be pushed to the P region, where they recombine with holes and then emit energy in the form of photons. This is the principle of LED luminescence. The wavelength of light, that is, the color of light, is determined by the material forming the P-N junction. Like it? Share it!More by this author |