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← ScienceWhich risk increases when a quantum dot laser wavelength is reduced by decreasing the dot size?
A)Decreased optical gain saturation power
B)Enhanced stimulated emission efficiency
C)Increased nonradiative recombination rate✓
D)Reduced Auger recombination threshold
💡 Explanation
As dot size decreases, energy levels become less confined, increasing wave function overlap, thereby quantum tunneling dominates. The increased tunneling causes enhanced carrier leakage and nonradiative recombination rates because electrons tunnel to defects, thus reducing device efficiency rather than improving stimulated emission.
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