Photoluminescence (PL) Spectroscopy

Located in the Quantum Optics Laboratory, Photoluminescence spectroscopy is a non-contact, nondestructive method of probing the electronic structure of materials. In essence, light is directed onto a sample, where it is absorbed and where a process called photo-excitation can occur. The photo-excitation (absorption of light) causes the material to jump to a higher electronic state, and will then release energy, (photons) as it relaxes and returns to back to a lower energy level. The emission of light, or luminescence through this process is photoluminescence, PL.

PL spectroscopy is a useful characterization tool to a wide-range of applications. For example:

  • Evaluation of light emitting materials and devices.
  • Band gap determination.
  • Defect and impurity level detection.
  • Study of recombination mechanisms.