Is it possible to synthesize Quantum dots (ZnO,CdS or another) by simple solution based synthesis (other methods include use of CVD, vapor phase transport etc.) whereby I can tune their sizes to achieve QDs with different excitation wavelengths? I have come across papers where tunability brings change in their emission wavelength. But I have never heard of tunability to yield QDs, possessing different excitation wavelengths.
Emission and excitation wavelengths are closely related in semiconductor QDs. Excitation is governed by size-dependent bandgap (in more detail, DOS in valence and conduction bands), and emission is governed by DOSs too,and additionally, by intraband relaxation process. Selective control of the latter is possible by eg shape change of QD, via varying pH, capping additive and so on
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