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Photophysical properties of CdSe quantum dot self-assemblies with zinc phthalocyanines and azaphthalocyanines.
MedLine Citation:
PMID:  23318549     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The formation of self-assemblies between CdSe quantum dots (QDs) and Zn phthalocyanines (Pc) and azaphthalocyanines (AzaPc) bearing alkylsulfanyl substituents and the photophysical properties of these assemblies were studied using both steady-state and time-resolved luminescence/absorption spectroscopy. The formation of the self-assemblies was accompanied by a blue shift of the Q band of the dyes and by a quenching of the CdSe QDs luminescence. The largest spectral shift of the Q-band was approximately 7 nm and was observed for pentan-3-ylsulfanyl-functionalised phthalocyanine (). Assuming a 1 : 1 stoichiometry, the calculated binding constant was 4 × 10(4) M(-1). Pc substituted with the bulky tert-butylsulfanyl groups () exhibited a smaller shift of the Q band. The quenching of the CdSe QDs luminescence by was more effective than that observed for . The results indicated that the luminescence quenching may be due to a photoinduced charge transfer between or and the CdSe QDs. In contrast, the AzaPc () with the same substituents as had little effect on the QDs luminescence. For all cases, we found an inefficient resonance energy transfer between the attached dyes and the CdSe QD. The formation of the self-assemblies had negligible effects on the photogeneration of the singlet oxygen, O(2)((1)Δ(g)), that was fully controlled only by the absorption of the light by the macrocycles.
Authors:
Jan Suchánek; Kamil Lang; Veronika Novakova; Petr Zimcik; Zdeněk Zelinger; Pavel Kubát
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-15
Journal Detail:
Title:  Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology     Volume:  -     ISSN:  1474-9092     ISO Abbreviation:  Photochem. Photobiol. Sci.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101124451     Medline TA:  Photochem Photobiol Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Praha 8, Czech Republic. pavel.kubat@jh-inst.cas.cz.
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