Breaking the carrier injection bottleneck of phosphor-free nanowire white light-emitting diodes

Hieu Nguyen, Shaofei Zhang, Ashfiqua T. Connie, Md Golam Kibria, Qi Wang, Ishiang Shih, Zetian Mi

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

We have examined the carrier injection process of axial nanowire light-emitting diode (LED) structures and identified that poor carrier injection efficiency, due to the large surface recombination, is the primary cause for the extremely low output power of phosphor-free nanowire white LEDs. We have further developed InGaN/GaN/AlGaN dot-in-a-wire core-shell white LEDs on Si substrate, which can break the carrier injection efficiency bottleneck, leading to a massive enhancement in the output power. At room temperature, the devices can exhibit an output power of ∼1.5 mW, which is more than 2 orders of magnitude stronger than nanowire LEDs without shell coverage. Additionally, such phosphor-free nanowire white LEDs can deliver an unprecedentedly high color rendering index of ∼92-98 in both the warm and cool white regions, with the color rendering capability approaching that of an ideal light source, i.e. a blackbody.

Original languageEnglish (US)
Pages (from-to)5437-5442
Number of pages6
JournalNano Letters
Volume13
Issue number11
DOIs
StatePublished - Nov 13 2013
Externally publishedYes

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carrier injection
Phosphors
phosphors
Nanowires
Light emitting diodes
nanowires
light emitting diodes
output
Color
color
Cable cores
Light sources
light sources
wire
Wire
augmentation
causes
room temperature
Substrates
Temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)

Cite this

Nguyen, H., Zhang, S., Connie, A. T., Kibria, M. G., Wang, Q., Shih, I., & Mi, Z. (2013). Breaking the carrier injection bottleneck of phosphor-free nanowire white light-emitting diodes. Nano Letters, 13(11), 5437-5442. https://doi.org/10.1021/nl4030165
Nguyen, Hieu ; Zhang, Shaofei ; Connie, Ashfiqua T. ; Kibria, Md Golam ; Wang, Qi ; Shih, Ishiang ; Mi, Zetian. / Breaking the carrier injection bottleneck of phosphor-free nanowire white light-emitting diodes. In: Nano Letters. 2013 ; Vol. 13, No. 11. pp. 5437-5442.
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Nguyen, H, Zhang, S, Connie, AT, Kibria, MG, Wang, Q, Shih, I & Mi, Z 2013, 'Breaking the carrier injection bottleneck of phosphor-free nanowire white light-emitting diodes', Nano Letters, vol. 13, no. 11, pp. 5437-5442. https://doi.org/10.1021/nl4030165

Breaking the carrier injection bottleneck of phosphor-free nanowire white light-emitting diodes. / Nguyen, Hieu; Zhang, Shaofei; Connie, Ashfiqua T.; Kibria, Md Golam; Wang, Qi; Shih, Ishiang; Mi, Zetian.

In: Nano Letters, Vol. 13, No. 11, 13.11.2013, p. 5437-5442.

Research output: Contribution to journalArticle

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