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?

Red (R), Green (G) and Blue (B) Light Emitting Diodes (LEDs) were fabr

1.	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
Answer» C. VR = VG = VB