The first peak, as cited previously, corresponds to the first electronic transition, from electron (E1) to the heavy hole (HH1).
Both times are consistent with a direct type-I electronic transition in QDs and a better overlap of electron and hole wave functions.
In larger molecules, several overlapping bands, one for each kind of electronic transition, can be emitted.
Any electronic transition will then be accompanied by simultaneous changes in vibrational and rotational energy states.
This can then be followed by an electronic transition back to the lower 1Δ state.
Thus any observed electronic transition will consist of a large number of closely spaced members owing to the vibrational and rotational energy changes.
The mercury atoms absorb the light energy, there being a suitable electronic transition in the atom that corresponds to the energy of the incident light.
This is because vibrational and rotational energies of molecules are only about 10−2 and 10−4, respectively, those of the electronic transition energies, and these many energies can be added to the energy of a single electronic transition, which is represented by a multitude of slightly different wavelengths making up one band.
Figure 4 indicates indirect electronic transition for all samples.
In undistorted octahedral coordination, only a single electronic transition occurs.
λ onset also indicates the electronic transition start wavelength.
