Theory 13/Nanoscale/Quantum dots
Dot Colour Is a Bohr Ratio
The claim
Quantum dot emission energy is set by the ratio of dot diameter to exciton Bohr radius, so small changes in size produce large colour shifts only below that scale.
01Mechanism
Confinement raises the energy of the exciton; the effect becomes strong only when the dot approaches the Bohr radius.
02Prediction
Colour should shift sharply below the Bohr ratio.
03Refutation
Colour tracking composition alone would remove confinement.