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Resonance energy transfer in self-organized organic/inorganic dendrite structures
Melnikau, D.; Savateeva, D.; Lesnyak, V.; Gaponik, Nikolai; Núnez Fernández, Yuriel; Vasilevskiy, Mikhail; Costa, M. F.; Mochalov, K. E.; Oleinikov, V.Hybrid materials formed by semiconductor quantum dots and J-aggregates of cyanine dyes provide a unique combination of enhanced absorption in inorganic constituents with large oscillator strength and extremely narrow exciton bands of the organic component. The optical properties of dendrite structures with fractal dimension 1.7–1.8, formed from J-aggregates integrated with CdTe quantum dots (QDs), have been inv...
Anti-stokes cooling in semiconductor nanocrystal quantum dots : a feasibility s...
Rakovich, Yury P.; Donegan, John F.; Vasilevskiy, Mikhail; Rogach, AndreyIn this review, we discuss the feasibility of laser cooling of semiconductor nanocrystal quantum dots by phonon-assisted anti-Stokes photoluminescence. Taking into account recent experimental advances, in particular, the development of semiconductor nanocrystals with very high quantum yield, we analyze in detail how the various physical processes in nanocrystals might help or hinder the cooling process. Possibl...
FIR absorption in CdSe quantum dot ensembles
Vasilevskiy, Mikhail; Rolo, Anabela G.; Artemyev, Mikhail; Filonovich, Sergey; Gomes, M. J. M.; Rakovich, Yury P.Absorption of far-infrared (FIR) radiation in very small CdSe crystallites (quantum dots, QDs) via excitation of confined dipolar vibrational modes was studied, both theoretically and experimentally. Spatial quantisation of optical phonons was analysed in the framework of a continuum model, which couples the phonon amplitude to the electrostatic potential via the Fro¨ hlich interaction. The frequencies and osci...
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