Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 24, Issue 4, Pages 321-323Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2011.2178091
Keywords
InGaN; light-emitting diodes (LEDs); molecular beam epitaxy; nanowire; quantum dot
Funding
- Natural Sciences and Engineering Research Council of Canada
- Canada Foundation for Innovation
- McGill University
- Natural Sciences and Engineering Research Council
- McMaster University, Hamilton, ON, Canada
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We report on the achievement of high-performance InGaN/GaN dot-in-a-wire red light-emitting diodes on Si(111) substrates. Owing to the superior 3-D carrier confinement offered by the self-organized dot-in-a-wire heterostructures, the devices exhibit relatively high (similar to 18%-32%) internal quantum efficiency at room temperature. Moreover, no efficiency droop was observed for injection current up to similar to 480 A/cm(2) under pulsed biasing conditions. We have also demonstrated that, by controlling the inhomogeneous broadening of the dot-in-a-wire heterostructures, the devices can exhibit relatively stable emission characteristics with increasing current.
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