GET 2012 batch can download the pdf file and can make any queries on subject in the comments box below.
Radiation detectors
View more presentations from Girishpalvai Kumar
How does a Light Emitting diode (LED) work?
Light Emitting Diode (LED) is always operated in forward bias mode.
Direct band semiconductors are used for LEDs.
Before applying voltage
After applying voltage
At sufficient voltage, electrons gain sufficient voltage so that they combine with holes to give light which has color that depends on energy gap of chosen semiconductor.
The wavelength of emitted light depends on energy gap and is expressed as 1.24 / Eg; where Eg is energy gap.
Equivalent circuit of a capacitor
The equivalent circuit of an actual capacitor shown below indicates that there are other characteristics besides capacitance to be considered.
i) Inductance (L) of the leads and plates
ii) Resistance (R1) of dielectric (leakage resistance)
iii) Resistance (R2) of leads and plates (effective series resistance)
iv) C is measured capacitance
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