LED Electroluminescence — Bandgap & Recombination Simulator

A forward-biased p-n junction floods its depletion region with injected electrons and holes. This simulator visualizes each carrier pair's fate at the junction: radiative recombination that emits a photon colored by the material's bandgap energy, or non-radiative recombination at a defect trap that dissipates the same energy as heat with no light at all. Tune the bandgap to sweep the emission color across the visible spectrum, and tune the defect density to watch internal quantum efficiency collapse as traps out-compete light emission.