14 April 1999 Frequency limits of high-efficiency non-resonant cavity light-emitting diodes
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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%.
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Paul L. Heremans, Paul L. Heremans, Reiner Windisch, Reiner Windisch, Alexander Knobloch, Alexander Knobloch, J. Potemans, J. Potemans, Barundeb Dutta, Barundeb Dutta, Gottfried H. Doehler, Gottfried H. Doehler, Gustaaf Borghs, Gustaaf Borghs, } "Frequency limits of high-efficiency non-resonant cavity light-emitting diodes", Proc. SPIE 3621, Light-Emitting Diodes: Research, Manufacturing, and Applications III, (14 April 1999); doi: 10.1117/12.344479; https://doi.org/10.1117/12.344479

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