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A planar LED fabricated from GaAs has a refractive index of 2.5. Compute the optical power emitted when transmission factor is 0.68.

A planar LED fabricated from GaAs has a refractive index of 2.5. Compute the optical power emitted when transmission factor is 0.68. Correct Answer 2.72 %

The optical power emitted is given by Pe = PintFn2/4nx2 = Pint (0.680×1/4×(2.5)2) = 0.0272 Pint. Hence power emitted is only 2.72 % of optional power emitted internally. Where, Fn2 = transmission factor nx = refractive index.

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