High-power, low-efficiency-droop semipolar (202̄1̄) single-quantum-well blue light-emitting diodes

Chih Chien Pan, Shinichi Tanaka, Feng Wu, Yuji Zhao, James S. Speck, Shuji Nakamura, Steven P. Den Baars, Daniel Feezel

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

We demonstrate a small-area (0.1mm 2) semipolar (202̄ 1̄) blue (447 nm) light-emitting diode (LED) with high light output power (LOP) and external quantum efficiency (EQE) by utilizing a single 12-nm-thick InGaN quantum well. The LED had pulsed LOPs of 140, 253, 361, and 460mW, and EQEs of 50.1, 45.3, 43.0, and 41.2%, at current densities of 100, 200, 300, and 400 A/cm 2, respectively. The device showed little blue shift and had a narrow full width at half maximum (FWHM). Micro-electroluminescence (μ-EL) and scanning transmission electron microscope (STEM) images indicate a high-quality InGaN quantum well (QW) layer.

Original languageEnglish (US)
Article number062103
JournalApplied Physics Express
Volume5
Issue number6
DOIs
StatePublished - Jun 2012
Externally publishedYes

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Semiconductor quantum wells
Light emitting diodes
light emitting diodes
quantum wells
Electroluminescence
Full width at half maximum
Quantum efficiency
blue shift
electroluminescence
quantum efficiency
Current density
Electron microscopes
electron microscopes
current density
Scanning
scanning
output

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

High-power, low-efficiency-droop semipolar (202̄1̄) single-quantum-well blue light-emitting diodes. / Pan, Chih Chien; Tanaka, Shinichi; Wu, Feng; Zhao, Yuji; Speck, James S.; Nakamura, Shuji; Den Baars, Steven P.; Feezel, Daniel.

In: Applied Physics Express, Vol. 5, No. 6, 062103, 06.2012.

Research output: Contribution to journalArticle

Pan, Chih Chien ; Tanaka, Shinichi ; Wu, Feng ; Zhao, Yuji ; Speck, James S. ; Nakamura, Shuji ; Den Baars, Steven P. ; Feezel, Daniel. / High-power, low-efficiency-droop semipolar (202̄1̄) single-quantum-well blue light-emitting diodes. In: Applied Physics Express. 2012 ; Vol. 5, No. 6.
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