Which impurity is added to gallium phosphide to make it an efficient l – McqOptions

MCQOPTIONS

1.	Which impurity is added to gallium phosphide to make it an efficient light emitter?
A.	silicon
B.	hydrogen
C.	nitrogen
D.	phosphorus
Answer» D. phosphorus

Discussion

No Comment Found

Related MCQs

Determine CW operating lifetime for LED with βrt = -0.58 and degradation rate βr= 7.86*10-11 h-1.
Determine degradation rate βrif constant junction temperature is 17 degree celsius.
Determine the 3 dB electrical bandwidth at 3 dB optical bandwidth Bopt of 56.2 MHz.
The optical power at 20 MHz is 246.2 μW. Determine dc drive current applied to device with carrier recombination lifetime for LED of 6ns.
When a constant d.c. drive current is applied to device, the optical o/p power is 320 μm. Determine optical o/p power when device is modulated at frequency 30 MHz with minority carrier recombination lifetime of LED i.e. 5ns.
The optical bandwidth is _____________ the electrical bandwidth.
The optical 3 dB point occurs when currents ratio is equal to
The overall power conversion efficiency of electrical lens coupled LED is 0.8% and power applied 0.0375 V. Determine optical power launched into fiber
Determine the overall power conversion efficiency of lens coupled SLED having forward current of 20 mA and forward voltage of 2 V with 170 μWof optical power launched into multimode step index fiber.
In a multimode fiber, much of light coupled in the fiber from an LED is