For LED’s to emit light in visible region of electromagnetic light, it should have energy band gap in the range of :
0.1 eV to 0.4 eV
0.5 eV to 0.8 eV
0.9 eV to 1.6 eV
1.7 eV to 3.0 eV
As we have learned
Photo diode -
A special type of photo detector.
- wherein
By measuring the change in the conductance of the semicondutors one can measure the intensity of the optical signal
For emitting visible light should lie between 34000 to 7600
Option 1)
0.1 eV to 0.4 eV
Option 2)
0.5 eV to 0.8 eV
Option 3)
0.9 eV to 1.6 eV
Option 4)
1.7 eV to 3.0 eV
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