Semiconducting Nanoparticles or Quantum Dots for Theranostics

Semiconductor colloidal nanocrystals are called “Quantum Dots” (QDs). QDs can be obtained when the semiconductor crystals are brought to a smaller diameter which is smaller than the Bohr exciton radius of the bulk material. QDs have a characteristic luminescence with nanoparticle size ranging from 3 to 10 nm. Compared to the conventional organic dyes, QDs have unique properties such as optical, electronic, absorption coefficients, superior signal brightness, resistance to photo bleaching and simultaneous multi-colour imaging with single excitation source.