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Show that the external quantum efficiency of a planar LED is given approximately by ηext

Show that the external quantum efficiency of a planar LED is given approximately by ηext = n−1(n + 1)−2, where n is the refractive index of the semiconductor–air interface. Consider Fresnel reflection and total internal reflection at the output facet. Assume that the internal radiation is uniform in all directions.

 

Jul 29 2020 View more View Less

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