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← ScienceWhen temperature increases within an LED's active region, which outcome regarding electron energy occurs?
A)Band gap narrowing and red-shift✓
B)Increased electron mobility uniformly shifts
C)Fermi level moves into valence
D)Electron-hole recombination becomes more efficient
💡 Explanation
Band gap narrowing occurs because increased thermal energy causes lattice expansion; therefore the band gap energy decreases, resulting in lower energy photons and an increased red-shift, rather than simply altering electron mobility or recombination efficiency.
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