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Proceedings Paper

Frequency limits of high-efficiency non-resonant cavity light-emitting diodes
Author(s): Paul L. Heremans; Reiner Windisch; Alexander Knobloch; J. Potemans; Barundeb Dutta; Gottfried H. Doehler; Gustaaf Borghs
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Paper Abstract

In this paper, we present measurements of the switch-on times and of the switch-off times of non-resonant cavity light-emitting diodes, compared to those of conventional reference diodes. From this comparison, we infer that the high quantum efficiency of NRC-LED's is not achieved by photon recycling, but purely by efficient extraction of generated photons. This is further corroborated by the good matching that is achieved between the measured switch-on times and theoretical predictions of the switch-on times. The latter are calculated with a model that includes only the electrical charging of the active layer and assumes that photon recycling does not occur. It is furthermore shown that the switch-on can be made faster by switching the diode between a non-zero low-state and the required high state. Doing so, an open eye diagram is achieved at 622 Mbit/s for a NRC-LED having an external quantum efficiency of 17%.

Paper Details

Date Published: 14 April 1999
PDF: 7 pages
Proc. SPIE 3621, Light-Emitting Diodes: Research, Manufacturing, and Applications III, (14 April 1999); doi: 10.1117/12.344479
Show Author Affiliations
Paul L. Heremans, IMEC (Belgium)
Reiner Windisch, IMEC (Germany)
Alexander Knobloch, Univ. Erlangen-Nuernberg (Germany)
J. Potemans, IMEC (Belgium)
Barundeb Dutta, IMEC (Belgium)
Gottfried H. Doehler, Univ. Erlangen-Nuernberg (Germany)
Gustaaf Borghs, IMEC (Belgium)

Published in SPIE Proceedings Vol. 3621:
Light-Emitting Diodes: Research, Manufacturing, and Applications III
E. Fred Schubert; Ian T. Ferguson; H. Walter Yao, Editor(s)

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