This paper proposes a method to enhance light extraction from light-emitting diodes (LEDs) by introducing a meta-grid of sub-wavelength plasmonic nanoparticles (NPs) on top of the LED chip. This meta-grid reduces Fresnel loss at the LED chip/encapsulant interface through destructive interference, boosting light transmission. The nanoparticle's composition, size, spacing, and distance from the chip surface are optimized for maximal transmission, potentially reaching 99% at the peak emission wavelength, compared to the typical 84%. This scheme improves energy efficiency and LED lifespan by reducing heating, and can be integrated into existing technologies.

Debabrata Sikdar, John B. Pendry, Alexei A. Kornyshev