Найдено научных статей и публикаций: 2, для научной тематики: Absorption and luminescence spectra
1.
M. V. Artemyev; A. A. Chistyakov; S. V. Daineko; V. A. Oleinikov; K. V. Zaharchenko
- Proceedings of SPIE , 2007
The films with low and high concentrations of CdSe/ZnS nanoparticles have been investigated under action of visible and ultra-violet laser radiation in a wide range of power densities and temperatures. Strong shifts of absorption and luminescence spectra without increase in their width have been obs...
The films with low and high concentrations of CdSe/ZnS nanoparticles have been investigated under action of visible and ultra-violet laser radiation in a wide range of power densities and temperatures. Strong shifts of absorption and luminescence spectra without increase in their width have been observed at the transition from the solution to the films of quantum dots. A complex investigation of anti-stokes luminescence of nanoparticles films has shown its thermal mechanism. Luminescence spectra of the films of quantum dots under action of ultra-violet laser radiation allow monitoring the presence of surface-active TOP and TOPO molecules in the films of quantum dots. The absence of surface-active molecules in the films with high concentration of CdSe/ZnS nanoparticles is shown. The modes of the action of power laser radiation on the films of quantum dots have been investigated. The possibility of controlling the thickness of the films by laser ablation has been shown.
2.
M. V. Artemyev; A. A. Chistyakov; S. V. Daineko; I. L. Martynov; I. R. Nabiev; V. A. Oleinikov; K. V. Zaharchenko
- Proceedings of SPIE , 2007
Optical properties of the films with high concentration of semiconductor core-shell CdSe/ZnS nanocrystals under action of visible laser radiation in a wide range of power densities have been investigated. It's shown that in the films with ultimate concentration ofthe nanocrystals a quantum-size effe...
Optical properties of the films with high concentration of semiconductor core-shell CdSe/ZnS nanocrystals under action of visible laser radiation in a wide range of power densities have been investigated. It's shown that in the films with ultimate concentration ofthe nanocrystals a quantum-size effect is observed. High concentration of the nanocrystals in the films and the presence of dipoles caused by nanoparticles asymmetry lead to strong shift of quantum-size peaks in absorption and luminescence spectra compared to the solution and the films with low concentration of the nanoparticles. The altitude of the shift depends on the thickness of the films and varies from 35 nm to 50 nm. The luminescence spectra of the films don't change until the power density of exciting laser radiation exceeds 1x106 W/cm2. The regimes of laser action on the films of the nanoparticles with power densities beyond the threshold of films destruction (from 5x10^6 W/cm^2 to 1x10^9 W/cm^2) have been investigated.