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← ScienceWhich outcome occurs when an LED's emitted photon energy nearly matches its band gap?
A)Increased radiative electron-hole recombination efficiency✓
B)Decreased internal quantum yield of photons
C)Enhanced defect carrier trapping probability
D)Reduced semiconductor crystal lattice phonon scattering
💡 Explanation
When photon energy nears band gap promoting radiative recombination increases because the rate of stimulated emission grows rapidly near the band edge. Radiative electron-hole recombination efficiency increases therefore, rather than lowered emission efficiency or the phonon scattering under other conditions.
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