Question
Download Solution PDFLight Emitting Diode (LED) converts ___________.
This question was previously asked in
Territorial Army Paper II : Official Practice Test Paper - 5
Answer (Detailed Solution Below)
Option 2 : electrical energy into light energy
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Detailed Solution
Download Solution PDFThe correct answer is electrical energy into light energy.
Key Points
- LED (light-emitting diode)
- The LED (light-emitting diode) is a PN junction device that emits light when a current passes through it in the forward direction, i.e. when LED is forward biased, it emits light.
- In an LED, this energy lies in the visible region of electromagnetic radiation, and the photon released is perceived as light.
- In reverse biased mode, it works like a normal diode and does not emit light.
- It is an optical semiconductor device that emits light when voltage is applied means it converts electrical energy into light energy. Hence, Option 2 is correct.
- When Light Emitting Diode (LED) is forward biased, the free electrons from the n-side and the holes from the p-side are pushed towards the junction.
- Light-emitting diodes emit either visible light or invisible infrared light when forward biased.
- The LEDs which emit invisible infrared light are used for remote controls.
- LEDs that can emit red, yellow, orange, green, and blue light are available for commercial use.
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