Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs

Peng Mao; Changxu Liu; Xiyan Li; Mengxia Liu; Qiang Chen; Min Han; Stefan A. Maier; Edward H. Sargent; Shuang Zhang

doi:10.1038/s41377-021-00621-7

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Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs

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- Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs
- Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs
- LSA 2021年10卷第10期页码：1840-1848
- Affiliations：
  
  1.School of Physics and Astronomy, University of Birmingham, B15 2TT, Birmingham, UK
  2.National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciencesand Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
  3.Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-Universitaet Muenchen, 80539, Muenchen, Germany
  4.Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, ON, M5S 1A4, Canada
  5.Key Laboratory of Intelligent Optical Sensing and Manipulation (Nanjing University), Ministry of Education, Nanjing, China
  6.Department of Physics, Imperial College London, London, SW7 2AZ, UK
  7.Department of Physics, University of Hong Kong, Hong Kong, 999077, China
  8.Department of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong, 999077, China
- Author bio：
  
  Changxu Liu (changxu.liu@physik.uni-muenchen.de)
  Edward H. Sargent (ted.sargent@utoronto.ca)
  Shuang Zhang (s.zhang@bham.ac.uk)
- Funds：
- DOI：10.1038/s41377-021-00621-7
  中图分类号：
- 纸质出版日期：2021-10-31，
  
  网络出版日期：2021-09-06，
  
  收稿日期：2021-02-08，
  
  修回日期：2021-08-13，
  
  录用日期：2021-08-19
- Accepted：
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Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs[J]. LSA, 2021,10(10):1840-1848.

Mao, P. et al. Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs. Light: Science & Applications, 10, 1840-1848 (2021).
Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs[J]. LSA, 2021,10(10):1840-1848. DOI： 10.1038/s41377-021-00621-7.

Mao, P. et al. Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs. Light: Science & Applications, 10, 1840-1848 (2021). DOI： 10.1038/s41377-021-00621-7.

摘要

Abstract

While total internal reflection (TIR) lays the foundation for many important applications

foremost fibre optics that revolutionised information technologies

it is undesirable in some other applications such as light-emitting diodes (LEDs)

which are a backbone for energy-efficient light sources. In the case of LEDs

TIR prevents photons from escaping the constituent high-index materials. Advances in material science have led to good efficiencies in generating photons from electron–hole pairs

making light extraction the bottleneck of the overall efficiency of LEDs. In recent years

the extraction efficiency has been improved

using nanostructures at the semiconductor/air interface that outcouple trapped photons to the outside continuum. However

the design of geometrical features for light extraction with sizes comparable to or smaller than the optical wavelength always requires sophisticated and time-consuming fabrication

which causes a gap between lab demonstration and industrial-level applications. Inspired by lightning bugs

we propose and realise a disordered metasurface for light extraction throughout the visible spectrum

achieved with single-step fabrication. By applying such a cost-effective light extraction layer

we improve the external quantum efficiency by a factor of 1.65 for commercialised GaN LEDs

demonstrating a substantial potential for global energy-saving and sustainability.

关键词

Keywords

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