LED emits Light:

Correct option is D

The correct answer is All of these.
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 biased, an LED will emit colored 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.
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