Abstract
Possible pathways and mechanisms of photoinduced relaxation processes in CdSe and CdSe/ZnS nanocrystals that are surface-passivated (as a result of two-point interactions) by nitrogen-containing ligands of different nature (pyridyl-substituted porphyrin molecules and their derivatives, 2,2′-dipyridyl, and 1,10-phenanthroline) are studied in toluene at 295 K by the methods of steady-state and time-resolved spectroscopy. In nanocrystal-organic ligand composites, a high luminescence-quenching efficiency of nanocrystals by molecules of tetrapyrrole compounds compared to 2,2′-dipyridyl, 1,10-shenanthroline, and pyridine can be associated with the electronic properties of a π conjugated macrocycle and anchor groups. The fundamental role that mesomeric effects and the partial overlap of HOMOs and LUMOs of porphyrin and meso-pyridyl rings play in the enhancement of nonradiative recombination of charges in a surface interface layer is substantiated.
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Original Russian Text © É.I. Zen’kevich, E.I. Sagun, A.A. Yarovoi, A.M. Shul’ga, V.N. Knyukshto, A.P. Stupak, C. von Borczyskowski, 2007, published in Optika i Spektroskopiya, 2007, Vol. 103, No. 6, pp. 998–1009.
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Zen’kevich, É.I., Sagun, E.I., Yarovoi, A.A. et al. Photoinduced relaxation processes in complexes based on semiconductor CdSe nanocrystals and organic molecules. Opt. Spectrosc. 103, 958–968 (2007). https://doi.org/10.1134/S0030400X0712020X
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DOI: https://doi.org/10.1134/S0030400X0712020X