Three-dimensional wavelength-scale confinement in quantum dot microcavity light-emitting diodes

We introduce a microcavity light-emitting diode (LED) structure that uses submicrometer oxide aperture and a quantum dot active region to achieve strong three-dimensional confinement of both the carrier distribution and the optical field. Light-current curves show optical emission for devices as sma...

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Bibliographic Details
Published in:Applied physics letters 2004-09, Vol.85 (12), p.2178-2180
Main Authors: Zinoni, C., Alloing, B., Paranthoën, C., Fiore, A.
Format: Article
Language:English
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Summary:We introduce a microcavity light-emitting diode (LED) structure that uses submicrometer oxide aperture and a quantum dot active region to achieve strong three-dimensional confinement of both the carrier distribution and the optical field. Light-current curves show optical emission for devices as small as 400 nm in diameter. Spectroscopy on electrically pumped LEDs, with apertures ranging from 2.5 down to 0.7 μ m , show several spectral lines corresponding to cavity modes. A strong blueshift of the resonant modes for smaller apertures demonstrates the role of the oxide aperture in confining laterally the optical wave in a volume comparable to ( λ ∕ n ) 3 . Due to the high quality factors and low mode volumes, the devices could be good candidates for the demonstration of the Purcell effect under electrical pumping.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1791341