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Which outcome occurs when electrons transit band gaps during electroluminescence?

A)Photon emission at spectral frequencies
B)Increased phonon scattering and heating
C)Reduced free-carrier current density
D)Enhanced electron-hole recombination rates

💡 Explanation

Photon emission occurs because electrons undergo radiative recombination (a type of spontaneous emission) when transitioning across the band gap. This generates photons with energy corresponding directly to the gap's energy rather than causing increased phonon scattering, an instance of energy loss.

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