4. Conclusion

Quantum dots have unique and highly attractive optical properties. The various syntheses developed over the last thirty years have made it possible to obtain nanocrystals with low size dispersion, whose fluorescence emission can be precisely controlled in wavelength. Various shell-growth techniques have made it possible to increase the resistance of quantum dots to environmental conditions, enabling us to study their optical properties at the single-particle level in detail, revealing the phenomenon of blinking. The emission of quantum dots changes randomly from a lighted, emissive state to an extinguished, non-emissive state. This extinguished state is due to the non-radiative recombination of the electron-hole pair (Auger recombination) in the case of a charged nanocrystal. We have shown that in a thick-shell CdSe/CdS core/shell system, Auger recombination loses efficiency compared with...