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← ScienceWhich risk increases when high-power light emitting diodes (LEDs) experience thermal runaway?
A)Drastic reduction of the band gap✓
B)Increased electron-phonon coupling
C)Minor shift interband transition energy
D)Increased radiative recombination efficiency
💡 Explanation
Increased temperature in LEDs causes a drastic reduction of the band gap, leading to more electron-hole pairs. This positive feedback accelerates thermal runaway because increased current flow further elevates temperature, and therefore reduces desired light emission, rather than promoting efficiency.
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