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2. (a) In the active region of light-emitting diodes, if carrier lifetime for SRH recombination is ten times longer than carrier lifetime for radiative

2. (a) In the active region of light-emitting diodes, if carrier lifetime for SRH recombination is ten times longer than carrier lifetime for radiative recombination, what is internal quantum efficiency? Assume Auger recombination is negligible, as compared to other recombinations and the injection efficiency is 100%. (b) When temperature increases of the LEDs by Joule heating in the diode, how does the IQE change and why. (c) If a light-extraction efficiency of the LED structure is 85%, calculate external quantum efficiency.

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