engineering recuitment GATE ECE 2023-24 Test Series Electronic Devices Optical Devices Light Emitting Diode (LED)
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?1
VR > VG > VB
2
VR < VG < VB
3
VR = VG = VB
4
VR > VG < VB