When we dope BiOCl nanoparticles inside the LDPE matrix, how can we decide whether it has a direct or indirect band gap?
Sakshi Sharma Absorption spectroscopy is a popular and straightforward technique for assessing whether a band gap is direct or indirect. One may often determine the band gap's value and whether it is direct by graphing specific powers of the absorption coefficient versus photon energy.
Sakshi Sharma I would like to add from what Amrit Kumar said,
By UV-vis: materials with a direct band gap, there will be a sharp increase in absorption at the energy corresponding to the band gap. In contrast, for materials with an indirect band gap, there will be a gradual increase in absorption as the energy approaches the band gap, followed by a sharp increase in absorption at a higher energy level.
By PL spectroscopy: For materials with a direct band gap, the emitted light will have a energy level corresponding to the band gap. In contrast, for materials with an indirect band gap, the emitted light will have a lower energy level than the band gap.
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