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← ScienceWhich outcome occurs when approaching the bandgap limit of nanocrystal quantum dots near 0 Kelvin?
A)Reduced electron-hole recombination efficiency
B)Increased fluorescence intermittency appears✓
C)Enhanced spectral red-shifting is induced
D)Improved quantum yield occurs consistently
💡 Explanation
Increased fluorescence intermittency (blinking) appears; this results from quantum tunneling. The electron becomes briefly trapped in surface states, quenching fluorescence, because thermal energy is inadequate to overcome energy barriers. Therefore ‘blinking’ rather than continuous emission occurs.
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