Nanoparticle meta-grid for enhanced light extraction from light-emitting devices

Light, Science & Applications
Debabrata SikdarAlexei A Kornyshev

Abstract

Based on a developed theory, we show that introducing a meta-grid of sub-wavelength-sized plasmonic nanoparticles (NPs) into existing semiconductor light-emitting-devices (LEDs) can lead to enhanced transmission of light across the LED-chip/encapsulant interface. This results from destructive interference between light reflected from the chip/encapsulant interface and light reflected by the NP meta-grid, which conspicuously increase the efficiency of light extraction from LEDs. The "meta-grid", should be inserted on top of a conventional LED chip within its usual encapsulating packaging. As described by the theory, the nanoparticle composition, size, interparticle spacing, and distance from the LED-chip surface can be tailored to facilitate maximal transmission of light emitted from the chip into its encapsulating layer by reducing the Fresnel loss. The analysis shows that transmission across a typical LED-chip/encapsulant interface at the peak emission wavelength can be boosted up to ~99%, which is otherwise mere ~84% at normal incidence. The scheme could provide improved transmission within the photon escape cone over the entire emission spectrum of an LED. This would benefit energy saving, in addition to increasing the lifet...Continue Reading

References

Jan 12, 2010·Applied Optics·Ivan MorenoMaximino Avendaño-Alejo
May 6, 2011·Chemical Reviews·Naomi J HalasPeter Nordlander
Aug 28, 2013·ACS Applied Materials & Interfaces·Tian LiYingfeng Yu
Sep 30, 2014·ACS Nano·Kae Jye SiWenlong Cheng
Feb 9, 2017·Proceedings of the National Academy of Sciences of the United States of America·Nozomi NishizawaHiro Munekata
Jan 14, 2018·Scientific Reports·Hayley WeirDebabrata Sikdar

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Methods Mentioned

BETA
chip
chips
light extraction

Software Mentioned

COMSOL Multiphysics
COMSOL

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