LED emits Light :

The correct answer is All of these.

Explanation:

Light-emitting diode (LED)

• The light-emitting diode (LED) is a commonly used standard light source in electrical equipment.
• It can be used for anything from your mobile phone to large advertising billboards.
• They are mostly found in devices that display time and various types of data.
• When an electric current flows through a light-emitting diode (LED), the device emits light.
• When current flows through an LED, electrons recombine with holes, resulting in the emission of light.
• LEDs allow current to flow in one direction but prevent it from flowing in the opposite direction.

• Light-emitting diodes are p-n junctions that have been heavily doped.
• When forward biassed, an LED will emit coloured light at a specific spectral wavelength depending on the semiconductor material used and the amount of doping.
• An LED is encapsulated with a transparent cover, so that the emitted light can be seen.
• LEDs can emit red, yellow, orange, green and blue light.