Semiconductor optoelectronics: What do LEDs in electronic toys emit? State the type of electromagnetic radiation typically produced by Light Emitting Diodes. Choose the correct option.
IIT JEE
Physics
Difficulty: Easy
Choose an option
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ABroadband white light only
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BMicrowaves
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CNearly monochromatic visible or infrared light
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DX-rays
Answer
Correct Answer: Nearly monochromatic visible or infrared light
Explanation
ConceptAn LED is a p–n junction that emits photons of energy ~ bandgap Eg, producing narrow-band (quasi-monochromatic) visible or IR light depending on semiconductor material.
Final AnswerNearly monochromatic visible or infrared light