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Photo-Luminescence (PL)

A National Facility Indian Institute of Technology Indore

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Photoluminescence spectroscopy works in a non- contact mode. It is a non-destructive technique of examining the materials electronic structure.

In spite of the fact that this technique is not qualitative in nature, it can be used to detect low, concentration of optical centers. The major scientific PL limitation is that several optical centers might possess numerous excited states that are vacant at low temperatures.Another major limitation of PL is that the luminescent signal gets disappeared. For example, in the PL characterization centers of silicon, no sharp-line PL from 969 meV centers were observed when they had captured self-interstitials.


  • Determination of Band gap.
  • Identification of level of Impurity as well as defect.
  • Recombination phenomena.
  • Surface structure and excited state