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Red (R), Green (G) and Blue (B) Light Emitting Diodes (LEDs) were fabricated using p-n junctions of three different inorganic semiconductors having different band-gaps. The built-in voltages of red, green and blue diodes are VR, VG and VB, respectively. Assume donor and acceptor doping to be the same (NA and ND, respectively) in the p and n sides of all the three diodes.
Which one of the following relationships about the built-in voltages is TRUE?
  • a)
    VR > VG > VB
  • b)
    VR < VG <VB
  • c)
    VR = VG = VB
  • d)
    VR > VG < VB
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Red (R), Green (G) and Blue (B) Light Emitting Diodes (LEDs) were fabr...
The bandgap of LED is related to its wavelength of light as:

Hence, as λ increases, the bandgap, and the build-in potential decreases, i.e.
For λR > λG > λB, the bandgap of the respective diodes will be:
⇒ VR < VG < VB
Free Test
Community Answer
Red (R), Green (G) and Blue (B) Light Emitting Diodes (LEDs) were fabr...
The bandgap of LED is related to its wavelength of light as:

Hence, as λ increases, the bandgap, and the build-in potential decreases, i.e.
For λR > λG > λB, the bandgap of the respective diodes will be:
⇒ VR < VG < VB
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Red (R), Green (G) and Blue (B) Light Emitting Diodes (LEDs) were fabricated using p-n junctions of three different inorganic semiconductors having different band-gaps. The built-in voltages of red, green and blue diodes are VR, VG and VB, respectively. Assume donor and acceptor doping to be the same (NA and ND, respectively) in the p and n sides of all the three diodes.Which one of the following relationships about the built-in voltages is TRUE?a)VR > VG > VBb)VR < VG <VBc)VR = VG = VBd)VR > VG < VBCorrect answer is option 'B'. Can you explain this answer?
Question Description
Red (R), Green (G) and Blue (B) Light Emitting Diodes (LEDs) were fabricated using p-n junctions of three different inorganic semiconductors having different band-gaps. The built-in voltages of red, green and blue diodes are VR, VG and VB, respectively. Assume donor and acceptor doping to be the same (NA and ND, respectively) in the p and n sides of all the three diodes.Which one of the following relationships about the built-in voltages is TRUE?a)VR > VG > VBb)VR < VG <VBc)VR = VG = VBd)VR > VG < VBCorrect answer is option 'B'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about Red (R), Green (G) and Blue (B) Light Emitting Diodes (LEDs) were fabricated using p-n junctions of three different inorganic semiconductors having different band-gaps. The built-in voltages of red, green and blue diodes are VR, VG and VB, respectively. Assume donor and acceptor doping to be the same (NA and ND, respectively) in the p and n sides of all the three diodes.Which one of the following relationships about the built-in voltages is TRUE?a)VR > VG > VBb)VR < VG <VBc)VR = VG = VBd)VR > VG < VBCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Red (R), Green (G) and Blue (B) Light Emitting Diodes (LEDs) were fabricated using p-n junctions of three different inorganic semiconductors having different band-gaps. The built-in voltages of red, green and blue diodes are VR, VG and VB, respectively. Assume donor and acceptor doping to be the same (NA and ND, respectively) in the p and n sides of all the three diodes.Which one of the following relationships about the built-in voltages is TRUE?a)VR > VG > VBb)VR < VG <VBc)VR = VG = VBd)VR > VG < VBCorrect answer is option 'B'. Can you explain this answer?.
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