1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Fluorescence Spectroscopy and Stokes Shift

  1. Dec 12, 2015 #1
    This is a question on fluorescence spectroscopy so physics/chemistry. What causes a large Stokes shift in the spectra? I know what causes the shift in wavelength, i.e., a relaxation of vibrational states before de-excitation to the ground state, but what actually causes a (very) large Stokes shift and what can it tell you about the organic molecule?
  2. jcsd
  3. Dec 14, 2015 #2

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Stokes shifts in fluorescent molecules are caused by thermal relaxation and depend on not just the fluorophore but also the chemical environment. Stokes shifts for quantum dots appears to involve a different mechanism, but I'm not expert enough to elaborate. There are some results on designing a Stokes shift:

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook