Comment

Comment by Dr.Claudio Gutiérrez on August 5, 2012 at 5:27pm

Luminescence is a consecuense of electronic transitions in semiconductor nanoparticles. Electrons localized in chemical bonds are released when absorb higher energy than the corresponding bond energy. Once released, electrons are free in the crystalline structure, certain time interval until a broken chemical bond catch it. Thinking in energy terms, electrons jump to higher level and after decay, returning part of the absorbed energy in light. In quantum dots, similar process occur, but slighly more complex. The emission of these CdS particles is due to electronic transitions from chemical bonds to insaturated bonds localized on nanoparticle surface. Due to crystal size, light emitted is visible, because you needed more energy to realise the electrons compared to micro or macroscopic CdS, and then you get yellow tonality.

Comment by Nikhil Bhardwaj on August 4, 2012 at 7:26pm

Can anyone pleasa tell me that why is it so much gliteering?????