The incorporation of modern teaching aids, such as videos, pictures, and demonstrations, rather than relying solely on textbooks, can increase student engagement and support understanding of the material. This is particularly important when dealing with abstract or complex concepts, such as the behavior of excited charge carriers, and specifically excitons, in semiconductors, where learning aids become essential tools for comprehension. In this educational article, we propose a working model of photoluminescence in semiconductors, with particular emphasis on semiconductors with a soft crystal lattice in which self-trapped excitons can form. The model can be easily replicated using a simple 3D printer and standard electronic components. The lesson is grounded in constructivist learning theory and implemented through the predict–observe–explain (POE) framework, which promotes active learning by encouraging students to compare their prior conceptions with experimental outcomes and refine their understanding accordingly, a particularly effective approach for illustrating photoluminescence. The proposed lesson plan is applicable from middle school classrooms to undergraduate chemistry courses.
Aridor et al. (Tue,) studied this question.