High-brightness polarized light-emitting diodes

Elison Matioli; Stuart Brinkley; Kathryn M Kelchner; Yan-Ling Hu; Shuji Nakamura; Steven DenBaars; James Speck; Claude Weisbuch

doi:10.1038/lsa.2012.22

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High-brightness polarized light-emitting diodes

Original Article

- High-brightness polarized light-emitting diodes
- High-brightness polarized light-emitting diodes
- LSA 2012年1卷第1期
- Affiliations：
  
  1.Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA
  2.Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA, USA
  3.Materials Department, University of California, Santa Barbara, CA, USA
  4.Laboratoire de Physique de la Matière Condensée, CNRS, Ecole Polytechnique, Palaiseau, France
- Author bio：
  
  Dr E Matioli, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Rm 39-663, Cambridge, MA 02139, USA E-mail: elison.matioli@polytechnique.org
- Funds：
- DOI：10.1038/lsa.2012.22
  中图分类号：
- 纸质出版日期：2012-03，
  
  网络出版日期：2012-08-03，
  
  收稿日期：2012-01-13，
  
  修回日期：2012-05-07，
  
  录用日期：2012-05-10
- Accepted：
Scan QR Code
High-brightness polarized light-emitting diodes[J]. LSA, 2012,1(1).

Matioli, E. et al. High-brightness polarized light-emitting diodes. Light: Science & Applications, 1, e22 (2012).
High-brightness polarized light-emitting diodes[J]. LSA, 2012,1(1). DOI： 10.1038/lsa.2012.22.

Matioli, E. et al. High-brightness polarized light-emitting diodes. Light: Science & Applications, 1, e22 (2012). DOI： 10.1038/lsa.2012.22.

摘要

Abstract

Light-emitting diodes are becoming the alternative for future general lighting applications

with huge energy savings compared to conventional light sources owing to their high efficiency and reliability. Polarized light sources would largely enhance the efficiency in a number of applications

such as in liquid-crystal displays

and also greatly improve contrast in general illumination due to the reduction in indirect glare. Here

we demonstrate light-emitting diodes presenting high-brightness polarized light emission by combining the polarization-preserving and directional extraction properties of embedded photonic-crystals applied to non-polar gallium nitride. A directional enhancement of up to 1.8-fold was observed in the total polarized light emission together with a high polarization degree of 88.7% at 465 nm. We discuss the mechanisms of polarized light emission in non-polar gallium nitride and the photonic-crystal design rules to further increase the light-emitting diode brightness. This work could open the way to polarized white-light emitters through their association with polarization-preserving down-converting phosphors.

关键词

Keywords

GaNLEDsm-planepolarized light

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