Dear experts,
Liquid carbon dots (CDs ) were synthesized with greenish color under UV-light. However, after mixing with PVA polymer, the color turned to blue with enhanced quantum yield (QY). what is the possible interaction made this enhancement? Is it related to hydrogen bonds of PVA or other reasons. Thanks in advance.
A guest-host structure has to be formed in this case, leading to the hypsochromic deviation in absorbance.
Look carefully at your data. since You list quantum yield, I assume the color is fluorescence. Was the original fluorescence green or a combination of blue and yellow - but now the yellow is gone? If it is a shift in the color from green to blue (higher energy, greater difference between the excited and ground states), either the ground state is stabilized or the excited state destabilized.
Please provide essential information on concentrations and phases of samples. As James E Hanson said, more spectral detail would be valuable in helping us assess the situation.
it might be helpful:
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