Improving the performance of leds has always been a research topic for scientists.A team at Imperial College London recently proposed embedding a customizable meta-grid of nanoparticles into leds to improve their light output and longevity.
Credit: Debabrata Sikdar, John B. Pendry, and Alexei A. Kornyshev
The researchers propose to improve the transfer of light generated inside the LED chip through the LED chip/package interface by reducing Fresnel Reflection Loss at the interface of fixed photons escaping from the inside of the chip/package, while providing for minimal changes in the process.
The study shows that the light transmission at the typical LED chip/package interface can be increased by 99% at peak emission wavelength, but only 84% at normal incidence.This scheme can improve the light transmission in the photon escape cone across the entire LED emission spectrum, which not only reduces energy consumption, but also improves the life of the LED by reducing the heat generated by unnecessary reflections inside the chip.
The researchers believe that this solution could be easily used and applied to existing semiconductor device technologies, and could be used independently or in combination with other methods to reduce LED critical Angle loss.
The study was published in July in the journal LED Light Science & Application.