4-mW microcavity LED at 650 nm on germanium substrates

Mark D'Hondt; Prasanta Modak; Danae Delbeke; Ingrid Moerman; Peter Van Daele; Roel G. Baets; Piet M. A. Demeester; Paul Mijlemans

doi:10.1117/12.382838

17 April 2000 4-mW microcavity LED at 650 nm on germanium substrates

Mark D'Hondt, Prasanta Modak, Danae Delbeke, Ingrid Moerman, Peter Van Daele, Roel G. Baets, Piet M. A. Demeester, Paul Mijlemans

Author Affiliations +

Proceedings Volume 3938, Light-Emitting Diodes: Research, Manufacturing, and Applications IV; (2000) https://doi.org/10.1117/12.382838
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States

Abstract

We report on the realization of red micro cavity LED's on germanium substrates, offering a significant cost advantage compared to GaAs wafers. The MCLED structure, grown by LP- MOVPE, consists of 3 GaInP quantum wells within a (detuned) 1- (lambda) AlGaInP cavity, enclosed by Al₉₅GaAs/Al₅₅GaAs DBR's, with a current spreading layer on top. MCLED's with a 200 micrometer aperture, exhibit a quantum efficiency up to 4.35% (at 10 mA) and an optical power higher than 4 mW (at 80 mA), without any packaging. The optical spectrum was centered at 650 nm, with a FWHM of plus or minus 13 nm. Because of the detuning the opening angle of these structures was as much as 120 degrees. Rudimentary packaging resulted in a luminous intensity of 2.5 cd at 30 mA, with an opening angle of plus or minus 13 degrees. Initially the electrical performance was not optimal, but additional tests and a new processing have indicated that forward biases as low as 2.0 V (at 20 mA) can be obtained for LED's on Ge-substrates. The new processing further resulted in an improved optical output with 5 mW at 80 mA. We feel there is room for further improvement, but already we have demonstrated the feasibility of germanium substrates for commercial red (to orange/yellow) LED applications.

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Mark D'Hondt, Prasanta Modak, Danae Delbeke, Ingrid Moerman, Peter Van Daele, Roel G. Baets, Piet M. A. Demeester, and Paul Mijlemans "4-mW microcavity LED at 650 nm on germanium substrates", Proc. SPIE 3938, Light-Emitting Diodes: Research, Manufacturing, and Applications IV, (17 April 2000); https://doi.org/10.1117/12.382838

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