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Which energy outcome appears when a quantum dot’s diameter decreases?

A)Bandgap increases in quantum confinement
B)Phonon scattering becomes amplitude-dependent
C)Radiative recombination decreases exponentially
D)Surface plasmon resonance shifts redshifted

💡 Explanation

As the quantum dot's diameter shrinks, electrons become more confined. Increased *quantum confinement* raises the energy levels, enlarging the bandgap, because smaller spaces require higher energies. Therefore, the material's bandgap increases due to spatial restriction, rather than other mechanisms like altering phonon spectra.

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