Abstract
For the first time, the anti‐Stokes luminescence in colloidal solutions of CdTe nanocrystals on excitation below the absorption edge has been discovered. The maximum spectral shift to the shortwave region relative to the excitation energy ΔE con max = 319 meV is obtained for mean‐sized nanocrystals (2.5 nm). The conversion efficiency of the absorbed radiant energy is η ∼ 1.3·10−2%. The rise in the anti‐Stokes photoluminescence intensity with increasing temperature and the linear dependence on the exciting radiation intensity have been established. It is shown that the effect observed cannot be caused by two‐photon excitation or by Auger recombination. It is assumed that the basic mechanism of the luminescence observed is the radiative recombination through the energy levels of the states attributable to the disturbance of the crystal structure in the nanocrystals.
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Rakovich, Y.P., Gladyshchuk, A.A., Rusakov, K.I. et al. Anti‐Stokes Luminescence of Cadmium Telluride Nanocrystals. Journal of Applied Spectroscopy 69, 444–449 (2002). https://doi.org/10.1023/A:1019767619766
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DOI: https://doi.org/10.1023/A:1019767619766