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Luminescence and Nonlinear Optical Properties of Hybrid Associates of Ag2S Quantum Dots with Molecules of Thiazine Dyes
- Source :
- Optics and Spectroscopy. 124:673-680
- Publication Year :
- 2018
- Publisher :
- Pleiades Publishing Ltd, 2018.
-
Abstract
- Spectral, kinetic, and nonlinear optical regularities that demonstrate the exchange of electronic excitations between the components of hybrid associates of Ag2S colloid quantum dots (1.7–1.8 nm) in gelatin with molecules of thiazine dyes (Ds) are found. When the IR luminescence of Ag2S quantum dots (QDs) is excited by radiation from the thionine absorption region, its enhancement due to nonradiative resonant energy transfer is observed. The association with methylene-blue molecules blocked the IR luminescence of Ag2S QDs upon its excitation by radiation from the absorption region of the dye due to the transfer of charge carriers. It is demonstrated that the hybrid association of thionine molecules and Ag2S QDs adversely affects the nonlinear optical properties of the latter, which manifests itself in inverse saturated absorption by the action of 10-ns second-harmonic pulses (532 nm) of a Nd3+:YAG laser. For the associates of Ag2S QDs with methylene-blue molecules, the radiation focusing caused by the transfer of charge carriers from the dye and the change in the population of small traps in nanocrystals is found. It is concluded that the direction of the transfer of electronic excitations and the photophysical processes in these objects are determined by the mutual arrangement of the HOMO–LUMO levels of the dye with respect to the levels of dimensional quantization of the Ag2S QDs.
- Subjects :
- Resonant inductive coupling
education.field_of_study
Materials science
Population
technology, industry, and agriculture
02 engineering and technology
equipment and supplies
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Atomic and Molecular Physics, and Optics
Thionine
Electronic, Optical and Magnetic Materials
010309 optics
chemistry.chemical_compound
Nanocrystal
chemistry
Quantum dot
Excited state
0103 physical sciences
Charge carrier
0210 nano-technology
Luminescence
education
Subjects
Details
- ISSN :
- 15626911 and 0030400X
- Volume :
- 124
- Database :
- OpenAIRE
- Journal :
- Optics and Spectroscopy
- Accession number :
- edsair.doi...........b2d163ed739a442556d6c15fd2505bfd