Synergistic Strategy of Dipole Position and Grating Design for Plasmon Energy Management in QLEDs

The performance of quantum dot light‐emitting diodes (QLEDs) is severely limited by the energy losses in surface plasmon polaritons mode. However, traditional optimization strategies for extracting surface plasmon polaritons mode largely overlook how the position of dipole affects light extraction efficiency. This article systematically investigates three representative dipole positions (fixed, concave, convex) relative to the grating. We found that the envelope of the extraction efficiency of a fixed‐position dipole consists of curves corresponding to convex positions and concave positions, which is a phenomenon caused by the periodic switching of their relative positions. Mechanistic analysis reveals that positioning the dipole on the grating concave maximizes the local density of optical states and the radiative Purcell factor, thereby optimizing energy distribution. Our synergistic strategy, which integrates dipole placement with grating design, achieves a peak extraction efficiency of 54% at a 174 nm period at the concave position, while significantly suppressing Ohmic losses. The results suggest a novel design paradigm for high‐efficiency QLEDs through the coengineering of nanostructures and dipole positions.