InP/ZnS Core-Shell Quantum Dot — Phosphide Nanoparticle Quantum Yield

Phosphide nanoparticles such as indium phosphide (InP) are the leading cadmium-free quantum dot chemistry, but a bare InP core oxidizes and traps excitons at unpassivated surface sites, killing most of its light output. This simulator renders a real 3D InP core wrapped in a ZnS shell, ties core radius to quantum-confined emission color via a Brus-style bandgap model, and ties shell thickness and native-oxide defect level to a competing radiative/non-radiative decay model that produces a live photoluminescence quantum yield. Watch red trap-capture sparks disappear as you grow the shell, and the exciton's own glow dim under heat — the exact synthesis trade-off that makes commercial InP/ZnS QLED and bio-imaging quantum dots always ship core/shell, never bare core.