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- Title
Photoinduced relaxation processes in complexes based on semiconductor CdSe nanocrystals and organic molecules.
- Authors
Zen'kevich, É.; Sagun, E. I.; Yarovoi, A. A.; Shul'ga, A. M.; Knyukshto, V. N.; Stupak, A. P.; von Borczyskowski, C.
- 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.
- Subjects
NANOCRYSTALS; LINEAR algebra; LINE geometry; MOLECULES; LASER spectroscopy
- Publication
Optics & Spectroscopy, 2007, Vol 103, Issue 6, p958
- ISSN
0030-400X
- Publication type
Article
- DOI
10.1134/S0030400X0712020X