What Does ZPL Stand For?

ZPL stands for Zero Phonon Line

ZPL, or Zero Phonon Line, refers to a spectral line observed in the emission or absorption spectra of solids, particularly in the context of point defects in crystals. It represents transitions between electronic energy levels that occur without the involvement of lattice vibrations, or phonons. The ZPL is significant in studying material properties, such as crystal quality and defect characterization, as it provides insights into the electronic structure of the material.