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Title: Large-signal-modulation of high-efficiency light-emitting diodes for optical communication
Knobloch, A
Kuijk, M
Rooman, C
Dutta, B
Kiesel, P
Borghs, Gustaaf
Dohler, GH
Heremans, Paul #
Issue Date: Dec-2000
Publisher: Ieee-inst electrical electronics engineers inc
Series Title: IEEE Journal of Quantum Electronics vol:36 issue:12 pages:1445-1453
Abstract: The dynamic behavior of high-efficiency light-emitting diodes (LEDs) is investigated theoretically and experimentally. A detailed theoretical description of the switch-on and switch-off transients of LEDs is derived. In the limit of small-signal modulation, the well-established exponential behavior is obtained. However, in the case of high injection, which is easily reached for thin active layer LEDs, the small-signal time constant is found to be up to a factor of two faster than the radiative recombination lifetime. Using such quantum-well LEDs, we have demonstrated optical data transfer,vith wide open eye diagrams at bit rates up to 2 Gbit/s, In addition, we have combined the use of thin active layers with the concept of surface-textured thin-film LEDs, which allow a significant improvement in the light extraction efficiency. With LEDs operating at 0.5 Gbit/s and 1 Gbit/s, we have achieved external quantum efficiencies of 36% and 29%, respectively.
ISSN: 0018-9197
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Electrical Engineering - miscellaneous
Physics and Astronomy - miscellaneous
ESAT - MICAS, Microelectronics and Sensors
# (joint) last author

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