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1. Photoluminescence

   Linked via "absorption profile"

   Photoluminescence Excitation (PLE) Spectroscopy
   PLE spectroscopy monitors the emission intensity at a fixed wavelength while systematically varying the excitation wavelength. The resulting spectrum maps the material's absorption profile as detected through the emission channel. For high-purity semiconductors, the $\text{PLE}$ spectrum should perfectly mirror the conventional absorption spectrum. Deviations, particularly the appearance of secondary excitation peaks in the nea…