Development of gallium-nitride-based light-emitting diodes (LEDs) and laser diodes for energy-efficient lighting and displays

Steven P. Denbaars, Daniel Feezell, Katheryn Kelchner, Siddha Pimputkar, Chi Chen Pan, Chia Chen Yen, Shinichi Tanaka, Yuji Zhao, Nathan Pfaff, Robert Farrell, Mike Iza, Stacia Keller, Umesh Mishra, James S. Speck, Shuji Nakamura

Research output: Contribution to journalArticle

248 Scopus citations

Abstract

Light-emitting diodes (LEDs) fabricated from gallium nitride (GaN) have led to the realization of high-efficiency white solid-state lighting. Currently, GaN white LEDs exhibit luminous efficacy greater than 150 lm W-1, and external quantum efficiencies higher than 60%. This has enabled LEDs to compete with traditional lighting technologies, such as incandescent and compact fluorescent (CFL) lighting. Further improvements in materials quality and cost reduction are necessary for widespread adoption of LEDs for lighting. A review of the unique polarization anisotropy in GaN is included for the different crystal orientations. The emphasis on nonpolar and semipolar LEDs highlights high-power violet and blue emitters, and we consider the effects of indium incorporation and well width. Semipolar GaN materials have enabled the development of high-efficiency LEDs in the blue region and recent achievements of green laser diodes at 520 nm.

Original languageEnglish (US)
Pages (from-to)945-951
Number of pages7
JournalActa Materialia
Volume61
Issue number3
DOIs
StatePublished - Feb 1 2013
Externally publishedYes

Keywords

  • GaN
  • LEDs
  • Laser diodes
  • Solid-state lighting

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Fingerprint Dive into the research topics of 'Development of gallium-nitride-based light-emitting diodes (LEDs) and laser diodes for energy-efficient lighting and displays'. Together they form a unique fingerprint.

  • Cite this

    Denbaars, S. P., Feezell, D., Kelchner, K., Pimputkar, S., Pan, C. C., Yen, C. C., Tanaka, S., Zhao, Y., Pfaff, N., Farrell, R., Iza, M., Keller, S., Mishra, U., Speck, J. S., & Nakamura, S. (2013). Development of gallium-nitride-based light-emitting diodes (LEDs) and laser diodes for energy-efficient lighting and displays. Acta Materialia, 61(3), 945-951. https://doi.org/10.1016/j.actamat.2012.10.042