How LED Works - Unravel the Mysteries of How LEDs Work!

sponsored by incopy why does this led produce a red light but this one produces a blue line when we apply a voltage across an LED it produces light it all comes from a tiny piece of semiconductor material inside which is emitting energy as photons but if we shine a light onto the LED then we are firing photons back into it so the process reverses and it will also produce a small voltage 80ds look something like this they come in different shapes colors and sizes for different applications LED stands for light emitting diode we use this symbol in engineering drawings for LEDs notice it looks very similar to a diode symbol except it has these arrows that indicate that light is being emitted LEDs and diodes both work on the same principle it's just a semiconductor material in the middle of some electrical connectors they both emit photons but only the LED emits photons in the range visible to humans and that's when the photon has a wavelength of around 400 to 700 nanometers we've received different colors depending on the wavelength of the photon in this range FM radio signal is also a photon wave but it's around 3 meters Wi-Fi signal is smaller at around six centimeters and a medical x-ray is Tiny at around 0.01 nanometers but we can't see any of these because they are outside of our visible spectrum have you ever noticed there's an LED in your TV remote this emits infrared light the photon has a wavelength typically around 940 nanometers so humans can't see it however you can see it on the camera of your phone inside the semiconductor we just have electrons combining with holes and releasing photons in the process we will learn how it works in more detail later on in this video now a standard diode uses different materials in its semiconductor layer which produce photons in the near infrared range these are absorbed by the casing and converted to heat so dodes become hot but LEDs produce very little heat unlike traditional incandescent lights which generate a lot of heat in this design the electrons collide with atoms in the filament and these collisions produce heat the filament heats up so much it produces visible light LEDs don't need to produce heat to produce light and so they are much more energy efficient ...