Optically stimulated luminescence dating wiki
It's an important, and relatively cheap tool for anthropology and paleontology.A good, clear graphic on the European Geosciences Union web pages explains how it works in general terms (link: https://eu/divisions/cl/tag/optically-stimulated-luminescence/).Does the heat/light knock loose a neighboring electron or two, making the negatively-charged defect a positively-charged defect? Or am I missing something else that's very obvious. I'm a geology teacher, and the more I teach, the more I realize I don't know.
The electron that was trapped acquires enough energy to leave the positively-charged defect in the lattice it had lived in for (some long period of time).