Femtosecond dynamics of photoexcitation in hybrid systems of CdS quantum dots with methylene blue

The dynamics of electronic excitation in hybrid associates of colloidal CdS quantum dots passivated by thioglycolic acid (CdS/TGA) with methylene blue cationic dye molecules (MB +) was studied by femtosecond transient absorption spectroscopy and nanosecond time-resolved spectroscopy. From the lumine...

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Bibliographic Details
Published inPhysica. E, Low-dimensional systems & nanostructures Vol. 118; p. 113898
Main Authors Smirnov, M.S., Buganov, O.V., Tikhomirov, S.A., Ovchinnikov, O.V.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.04.2020
Subjects
Hybrid systems
Luminescence decay
Methylene blue
Pump-probe
Quantum dots
Hybrid systems
Quantum dots
Pump-probe
Luminescence decay
Methylene blue
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Summary:The dynamics of electronic excitation in hybrid associates of colloidal CdS quantum dots passivated by thioglycolic acid (CdS/TGA) with methylene blue cationic dye molecules (MB +) was studied by femtosecond transient absorption spectroscopy and nanosecond time-resolved spectroscopy. From the luminescence decays it was found that non-radiative resonance energy transfer (FRET) from the recombination luminescence centers accompanied by acceptor fluorescence is observed in the CdS/TGA-MB+ systems with MB+ monomers. It was found that in the exciton decay dynamics of the hybrid systems based on CdS/TGA QDs and methylene blue, there is substantial competition between the resonance energy transfer in MB+ and the energy transfer to MB• and MBOH• forms. •MBOH• is formed in associates of CdS/TGA QDs with methylene blue (MB).•Non-radiative energy transfer from center of trap state luminescence to MB is found.•Efficient excitation transfer from exciton in CdS/TGA QDs to MB is established.
ISSN:1386-9477
1873-1759
DOI:10.1016/j.physe.2019.113898