How to Calculate Band Gap Energy from UV–DRS Data | Kubelka–Munk Method in OriginLab

In this tutorial, I’ll show you step by step how to calculate the optical band-gap energy (Eg) from Diffuse Reflectance Spectroscopy (UV–DRS) data using the Kubelka–Munk function in OriginLab.

You will learn:
✅ How to convert reflectance data into the Kubelka–Munk function
✅ How to calculate photon energy (hv) from wavelength
✅ How to plot
[F(R)⋅hv]^γ vs hv for both direct and indirect band gaps
✅ How to extract the band-gap energy (Eg) from the linear fit
In my previous video, I explained the Tauc plot method for absorbance data. If you haven’t seen it yet, check it out here.

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