s you have discovered, different compositions of semiconductors emit different c

Question

s you have discovered, different compositions of semiconductors emit different colors of light with different photon energies.

The energy of each photon (Ephoton) emitted from an LED is equal in energy to the band gap (Eg). Recall that the photon energy can be calculated from wavelength:

Eg= Ephoton
Ephoton = hc/

Where the variables h and c are constants:

Planck ’s Constant, h = 6.626 x 10-34 Js
Speed of Light, c = 3.0 x 108 m/s

Conversion Factors:

1 m = 1 x 109 nm

Part C - Looking at the equations given above, what is the relationship between band gap energy and the wavelength of light emitted from a semiconductor?

Explanation / Answer

band gap energy = energy of photon

so,

band gap energy = h*c/lambda

= (6.626*10^-34 * 3*10^8)/lambda

=1.9878*10^-25 /lambda

This is the relationship where wavelength is in m

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