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Title: Light-emitting diodes with 31% external quantum efficiency by outcoupling of lateral waveguide modes
Heremans, Paul
Knobloch, A
Kiesel, P
Dohler, GH
Dutta, B
Borghs, Gustaaf #
Issue Date: Apr-1999
Publisher: Amer inst physics
Series Title: Applied Physics Letters vol:74 issue:16 pages:2256-2258
Abstract: The external quantum efficiency of light-emitting diodes (LEDs) is usually limited by total internal reflection at the semiconductor-air interface. This problem can be overcome by a combination of light scattering at a textured top surface and reflection on a backside mirror. With this design, we achieve 22% external quantum efficiency. One of the main loss mechanisms in such nonresonant cavity (NRC) light-emitting diodes is coupling into an internal waveguide. Texturing the surface of this waveguide allows the partial extraction of the confined light. In this way, we demonstrate an increase in the external quantum efficiency of NRC-LEDs to 31%. (C) 1999 American Institute of Physics. [S0003-6951(99)03916-9].
ISSN: 0003-6951
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Electrical Engineering - miscellaneous
Physics and Astronomy - miscellaneous
ESAT - MICAS, Microelectronics and Sensors
× corresponding author
# (joint) last author

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