Spectral-kinetic properties of transient absorption of hybrid silver–copper phthalocyanine nanostructures
https://doi.org/10.29235/1561-2430-2020-56-4-470-479
Abstract
In this paper, we studied the dynamics of transient absorption spectra of a hybrid nanostructure (Ag–CuPc)6 Ag based on island silver films and copper phthalocyanine thin films, as well as individual structural units of this system, by femtosecond transient absorption spectroscopy. It is found that the effects observed for a hybrid nanostructure reflect the existing mutual influence of the plasmonic and organic subsystems on the spectral-kinetic characteristics of each other. The characteristic time of the main component of induced optical density kinetics at a wavelength λ = 525 nm (τ ~ 15 ps) that is caused by singlet-triplet relaxation of the excited electronic states of the organic subsystem of the hybrid structure is noticeably shorter than the relaxation time (τ ~ 50 ps) at the same wavelength for a pure copper phthalocyanine film of 40 nm thickness, just the same as the total thickness of the organic subsystem in the hybrid structure. It is assumed that the presence of silver nanoparticles in the hybrid structure (Ag–CuPc)6 Ag, affects the probability of intersystem conversion in the organic subsystem, accelerating the transition of CuPc molecules to a long-lived triplet state due to a strong local field near the surface of the plasmon particle. The triplet-triplet absorption spectrum of copper phthalocyanine in the spectral range 470–750 nm was obtained.
About the Authors
K. A. Barbarchyk
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Katsiaryna A. Barbarchyk – Junior Researcher of the Center of Photonics of Atoms and Molecules Structures
68-2, Nezavisimosti Ave., 220072, Minsk
O. V. Buganov
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Oleg V. Buganov – Ph. D. (Physics and Mathe- matics), Leading Researcher of the Center of Photonics of Atoms and Molecules Structures
68-2, Nezavisimosti Ave., 220072, Minsk
A. D. Zamkovets
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Anatoly D. Zamkovets – Ph. D. (Physics and Mathematics), Leading Researcher of the Center of Photonics of Atoms and Molecules Structures
68-2, Nezavisimosti Ave., 220072, Minsk
S. A. Tikhomirov
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Sergey A. Tikhomirov – Dr. Sc. (Physics and Mathematics), Corresponding Memberof the National Academy of Sciences of Belarus, Scientific Head of the Center of Photonics of Atoms and Molecules Structures
68-2, Nezavisimosti Ave., 220072, Minsk
Viet Tiep Phung
Institute of Physics, Vietnam Academy of Science and Technology
Viet Nam
Viet Nam
Phung Viet Tiep – Ph. D. (Physics and Mathematics), Head of the Research Group
10, Dao Tan Str., Cong Vi, Da Dinh, Нanoi
Hong Minh Pham
Institute of Physics, Vietnam Academy of Science and Technology
Viet Nam
Viet Nam
Pham Hong Minh – Ph. D. (Physics and Mathematics), Head of Laboratory, Vice Director of Center for Quantum electronics
10, Dao Tan Str., Cong Vi, Da Dinh, Нanoi
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