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The radiative and nonradiative recombination lifetimes of minority carriers in the active region of a double heterojunction LED are 60nsec and 90nsec respectively. Determine..

The radiative and nonradiative recombination lifetimes of minority carriers in the active region of a double heterojunction LED are 60nsec and 90nsec respectively. Determine the total carrier recombination lifetime and optical power generated internally if the peak emission wavelength si 870 nm and the drive current is 40 mA.

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Solution:

Given:

λ = 870 nm 0.87 x 10-6 m

τr = 60 nsec.

τnr = 90 nsec.

I = 40 mA = 0.04 Amp.

i) Total carrier recombination lifetime:

1τ=1τr+1τnr

1τ=160+1901τ=1505400

ii) Internal optical power.

Pint =ηint hcIqλ

iii) Pint =(ττr)( hc Iqλ)

iv,)

Pint =(3060)[(6.625×1034)(3×108)×0.04(1.602×1019)(0.87×106)]

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