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10 April 2007 Laser induced luminescence of dense films of CdSe/ZnS nanoparticles
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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 5x106 W/cm2 to 1x109 W/cm2) have been investigated.
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M. V. Artemyev, A. A. Chistyakov, S. V. Daineko, I. L. Martynov, I. R. Nabiev, V. A. Oleinikov, and K. V. Zaharchenko "Laser induced luminescence of dense films of CdSe/ZnS nanoparticles", Proc. SPIE 6613, Laser Optics 2006: Wavefront Transformation and Laser Beam Control, 66130M (10 April 2007);

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