||PN junction diode
|The LED emits light.
||The PN junction diode cannot emit light.
|The LED uses GaAs, GaAsP or GaP material.
||The PN junction diode silicon or germanium material.
|In LED all energy converted into a light
||In PN junction diode all energy converted into a heat.
|It’s on state voltage ranges between 1.2 V to 2.0 V.
||Its on-state voltage drop is 0.7 V for silicon diode and 0.3 V for germanium diode.
|It has very low value of reverse breakdown voltage.
||It has high value of reverse breakdown voltage.
|It is used as a light source in fiber optics, as an indicator in 7 segment displays etc.
||It is used in rectifiers, clippers, clamping, voltage multipliers etc.