How to calculate the energy band gap in UV-Visible spectra ?

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N. Venkatathri

Probably difference from the lower to higher absorption levels of wavelength.

Himamaheswara Rao Mahesh

We can find the energy band gap using the tauc plot model

as in the attached file.

we may use direct or indirect band gap depending upon our material's property.

@Ahmad sousaraei

it is 1239/Wavelength= in ev.

Gopal Singh

I agree with Aleksey, absorption edge technique is reliable method of calculating band gap.

Dheeraj Kumar

Here you can find good explanation and band gap calculator,

http://www.instanano.com/characterization/theoretical/uv-vis-spectroscopy-band-gap-calculation/

Payam Margan

There is some details on my paper:

Article Hydrothermal-assisted sol–gel synthesis of Cd-doped TiO2 nan...