Discussion
Quantum confinement occurs when a particle's size becomes comparable to the
Answer: D
Correct answer: wavelength of its charge carriers
When the particle becomes comparable with the de Broglie wavelength of its electrons and holes - the exciton Bohr radius - the carriers are squeezed and their energy levels become discrete and size-dependent. This is why a quantum dot’s band gap, and so its emission colour, can be tuned simply by changing its diameter.
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