Micro-light emitting diode (LED) arrays with diameters of 4 to 20 μm have been fabricated and were found to be much more efficient light emitters compared to their broad-area counterparts, with up to five times enhancement in optical power densities. The possible mechanisms responsible for the improvement in performance were investigated. Strain relaxation in the microstructures as measured by Raman spectroscopy was not observed, arguing against theories of an increase in internal quantum efficiency due to a reduction of the piezoelectric field put forward by other groups. Optical microscope images show intense light emission at the periphery of the devices, as a result of light scattering off the etched sidewalls. This increases the extraction efficiency relative to broad area devices and boosts the forward optical output. In addition, spectra of the forward emitted light reveal the presence of resonant cavity modes [whispering gallery (WG) modes in particular] which appear to play a role in enhancing the optical output.
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15 May 2003
Research Article|
May 15 2003
Mechanism of enhanced light output efficiency in InGaN-based microlight emitting diodes
H. W. Choi;
H. W. Choi
Institute of Photonics, University of Strathclyde, Glasgow, G4 0NW, United Kingdom
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C. W. Jeon;
C. W. Jeon
Institute of Photonics, University of Strathclyde, Glasgow, G4 0NW, United Kingdom
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M. D. Dawson;
M. D. Dawson
Institute of Photonics, University of Strathclyde, Glasgow, G4 0NW, United Kingdom
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P. R. Edwards;
P. R. Edwards
Department of Physics, University of Strathclyde, Glasgow, G4 0NG, United Kingdom
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R. W. Martin;
R. W. Martin
Department of Physics, University of Strathclyde, Glasgow, G4 0NG, United Kingdom
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S. Tripathy
S. Tripathy
Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602
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J. Appl. Phys. 93, 5978–5982 (2003)
Article history
Received:
December 16 2002
Accepted:
February 21 2003
Citation
H. W. Choi, C. W. Jeon, M. D. Dawson, P. R. Edwards, R. W. Martin, S. Tripathy; Mechanism of enhanced light output efficiency in InGaN-based microlight emitting diodes. J. Appl. Phys. 15 May 2003; 93 (10): 5978–5982. https://doi.org/10.1063/1.1567803
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