Recently the addition of M<sup>2+</sup> Lewis acids (M = Cd, Zn) to InP quantum dots has been shown to enhance the photoluminescence quantum yield (PL QY). Here we investigate the stability of this Lewis acid layer to post synthetic processing such as purification and ligand exchange. We utilize gel permeation chromatography to purify the quantum dot samples as well as to aid in the ligand exchange reactions. The Lewis acid-capped particles are stable to purification and maintain the enhanced luminescent properties. We demonstrate successful ligand exchange on the quantum dots by switching the native carboxylate ligands to phosphonate ligands. Changes in the optical spectra after exposure to ambient environment indicate that both carboxylate- and phosphonate-capped QDs remain air sensitive.

Purification and <i>in situ</i> ligand exchange of metal-carboxylate-treated fluorescent InP quantum dots via gel permeation chromatography

255th National Meeting (2018)

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Purification and in situ ligand exchange of metal-carboxylate-treated fluorescent InP quantum dots via gel permeation chromatography