LEDs are transducers of electricity into light. They operate in reverse of photodiodes, which convert light into electricity. Electroluminescence from a solid state diode was discovered in 1906 by Henry Joseph Round of Marconi Labs, and was published in February 1907 in Electrical World.

2 days ago · An LED (light-emitting diode) is a semiconductor device that emits infrared or visible light when charged with an electric current.

Light emitting diodes form numbers on digital clocks, send data from remote controls and illuminate watches - the simple genius of the design makes it infinitely applicable. And now, LEDs are affordable.

The Basics of LED Lighting What are LEDs and how do they work? LED stands for light emitting diode. LED lighting products produce light up to 90% more efficiently than incandescent light bulbs. How do they work? An electrical current passes through a microchip, which illuminates the tiny light sources we call LEDs and the result is visible light.

Feb 24, 2012 · What is a Light Emitting Diode (LED)? A Light Emitting Diode (LED) is a special type of PN junction diode. The light emitting diode is specially doped and made of a special type of semiconductor. This diode can emit light when it is in the forward biased state.

Jun 10, 2025 · A light-emitting diode (LED) is a small electronic device that emits light when an electric current flows through it. LED works by passing electricity through a semiconductor, which releases energy in the form of light.

The first question that might pop into your mind is, what is exactly an LED? A regular diode is a semiconductor device that works as a one-way switch for electrical current. It allows current in only one direction and will stop it from flowing in the other. An LED works the same way.

Jan 1, 2025 · A LED or light-emitting diode is an electrical component that produces light when current passes through it. LEDs are semiconductor devices, light is produced when the electrons combine with the material used as the semiconductor. LEDs can come in a variety of different shapes, colours and sizes.

Like a normal diode, the LED consists of a chip of semiconducting material impregnated, or doped with impurities to create a p-n, (positive / negative) junction.