How Does an LED Work?

TL;DR

An LED is a special type of diode that emits light when electricity passes through it.

Transcript

How Does an LED Work? An LED or “Light Emitting Diode” is basically as the name describes; it is a special type of diode that is specifically optimized to give off light, usually in the visual or infrared spectrum, as electricity is passed through it. A diode is a special type of semiconductor that has many uses. One of the principle uses though is... Read More

Key Insights

• 👫 Diodes, including LEDs, control the flow of electricity using a "p-n junction."
• 🙂 LEDs emit light when electrons change their energy states within the diode.
• 🙂 The color of the light emitted by an LED depends on the material used and the current passing through it.
• 😃 Infrared LEDs, although not visible to the human eye, have various practical applications.

Questions & Answers

Q: What is an LED?

An LED, or Light Emitting Diode, is a specialized type of diode that emits light when electricity passes through it.

Q: How does a diode control the flow of electricity?

Diodes have a "p-n junction" that allows current to flow in one direction while blocking it in the opposite direction.

Q: How does an LED produce light?

When electrons from the "n-type" side fill holes in the "p-type" side of the diode, they lose energy and emit photons, resulting in the production of light.

Q: Can LEDs emit light in the visible spectrum?

Yes, LEDs can be made of semiconductor materials that create a significant drop in the electron's orbit, allowing the emitted light to fall within the human visual spectrum.

Summary & Key Takeaways

• An LED is a type of diode that controls the flow of electricity and is optimized to emit light.

• Diodes have a "p-n junction" that allows current to flow in one direction only.

• LEDs emit light when electrons from the "n-type" side fill holes in the "p-type" side, resulting in a change in energy and the release of photons.