Which LEDs exhibit emission of light in a perpendicular direction to the PN junction plane?
Options: a. Surface- emitting LEDs
b. Edge -emitting LEDs
c. Multicolored LEDs
d. All of the above
Correct Answer: a. Surface - emitting LEDs
Explanation:By taking into consideration the constructional arrangement of surface-emitting LEDs, P-type layer gets deposited over the N-type substrate by diffusion process.
P-layer is kept on the uppermost portion because of the generation of carrier recombination in the same layer itself.
The operational strategy of surface emitting LED can be confined with an assistance of below drawn schematic view.
However, surface LEDs emit light in accordance to the requisite forward current. The quantity of transmitted output power has a direct relationship with the forward current.
This conceptual notion can be exemplified in the graph that exhibit the relationship between transmitted output power and the forward current.
It is obvious from the above graph that maximum the forward current, greater is the light output.
