I've been looking on journals and textbook, as well as internet. Does anybody know if there is an equation to find out the value of direct optical band gap and indirect optical band gap? What is the difference of optical band gap, direct optical bandgap and indirect optical bandgap?(adsbygoogle = window.adsbygoogle || []).push({});

also

Does anybody recognised this equation

E_{g}=hω/λ_{ae}

where E_{g}= optical band gap , λ_{ae}= wavelength at absorption edge

Please enlighten me.

Thanks.

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# Direct and Indirect Optical Band Gap

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