What is LED? - Season Solar Lighting

What is LED?

A light-emitting diode (LED) is a semiconductor device that produces light from electricity.
Also is a type of diode that makes one color of light when electricity is sent through it in the expected direction (electrically biased in the forward direction). This effect is a kind of electroluminescence.

It is constituted from group III and V compound semiconductor. Injected from the P zone under the action of the forward bias voltage, the N area of the hole and electron injected into the P region by the N-region, in the vicinity of the PN junction of several microns, respectively, with the N region of the electron and hole recombination in the P region. generating spontaneous fluorescence radiation.

LEDs are produced in a variety of shapes and sizes. The color of the plastic lens is often the same as the actual color of light emitted, but not always. For instance, purple plastic is often used for infrared LEDs, and most blue devices have colorless housings. Modern high-power LEDs such as those used for lighting and backlighting are generally found in surface-mount technology (SMT) packages (not shown).