Spectroscopy

Fluorescence from quantum dots

Cadmium selenide (CdSe) quantum dots are chemically synthesized in the diameter ranges of 2 to 6 nm. These colloidal solutions are excited with a blue laser of wavelength 405 nm and the fluorescence emission spectrum is observed using a fiber optic spectrometer. The emission wavelength depends on the sizes of the dots, the wavelength is directly proportional to the size (radius) of the nanoparticle. The demonstration is a beautiful, lucid example of the effect of size on the quantization of energy levels and brings home the idea of the potential well quite neatly.

Here is a Presentation on fluorescence from CdSe quantum dots shown in class on 18 April 2013.

 

By Azeem Iqbal | Modern Physics . Spectroscopy
DETAIL

PhysLab

Preparing an institutional and national platform for student-driven experimental research in physics.

CONTACT US

Email: physlab.org@gmail.com Telephone: 111-11-LUMS (5867) Address: Lahore University of Management Sciences (LUMS), Sector U, DHA, Lahore Cantt. 54792, Pakistan
TOP