6Q30.10 - Quantum Dots
To demonstrate how quantum dots of different radii will fluoresce at different wavelengths when illuminated by a 405nm light source.
Provide the sealed and mounted quantum dot vials and the 405 nm laser pointer light source. The produced fluorescing wavelengths are different enough for your eyes to tell the difference between them. If desired, provide the Ocean Optics spectroscope with laptop computer if the professor requests it.
Illuminate the quantum dot mixtures from below with the 405nm light source. Each vial will fluoresce at a different wavelength, which is directly related to the radius of the quantum dots that are dissolved in the solution. This demonstration is a real world example of the particle in a box problem.
Color Peak Wavelength RadiusGreen 540 nm 2.367454 nmYellow 570 nm 2.533894 nmOrange 600 nm 2.718174 nmRed 630 nm 2.924941 nm