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Emission Profile Dependence of Microcavity Light Emitting Diodes

Data are presented to show the variation in the emitted radiation pattern of semiconductor microcavity light emitting diodes (MC-LEDs) with different cavity mode de-tunings. Compared to a conventional non-cavity LED structure, a narrow single-lobed emission profile is only observed when the cavity mode is de-tuned greater then 15 nm below the bare quantum well peak. For positively de-tuned MC-LEDs, the beam divergence broadens, and the far-field emission profiles exhibit a double-lobed emission pattern, which is sensitive to the pump level.