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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...
Confined optical vibrations in CdTe quantum dots and clusters
Rolo, Anabela G.; Vasilevskiy, Mikhail; Gaponik, Nikolai; Talapin, Dmitrii; Rogach, Andrey; Gomes, M. J. M.Absorption of far-infrared (FIR) radiation and Raman scattering in CdTe nano-crystals (spherical quantum dots (QDs) of several nanometers in size) and Cd54Te32(SCH2CH2OH)8- 32 clusters prepared by colloidal synthesis were studied. Raman spectra of both QDs and clusters are dominated by a peak situated slightly below the bulk CdTe LO phonon frequency. Experimental FIR transmittance spectra of films containing Cd...
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