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Determine the Wavelength of light emitt...

Determine the Wavelength of light emitted from LED which is made up of GaAsP semiconductor whose forbidden energy gap is 1.875 eV.Mention the colour of the light emitted.

Text Solution

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`E_g=(hc)/(lambda)`
Therfore ,`lambda=(hc)/(E_g)=(6.6xx10^(-34)xx3xx10^(8))/(1.875xx1.6xx10^(-19))=660nm` The wavelength 660 nm corresponds to red colour light.
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