Question
Download Solution PDFA PN junction diode that ____ when activated is called a/an _______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 4.
Light Emitting Diode (LED)
- It is a PN junction diode that emits light when it is forward-biased.
- When forward current is passed through the light-emitting diode, carriers (electrons and holes) move.
- The holes in the p-type region move to the n-type region and the electrons in the n-type region move to the p-type region.
- The injected carriers recombine, and the energy difference before and after recombination is released as light.
- The color of the light is determined by the energy required for electrons to cross the band gap of the semiconductor.
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