Fluorescence Spectroscopy and Stokes Shift

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SUMMARY

The discussion focuses on the causes of large Stokes shifts in fluorescence spectroscopy, emphasizing the role of thermal relaxation and the chemical environment surrounding the fluorophore. It is established that Stokes shifts vary significantly between different fluorescent molecules and quantum dots, which may involve distinct mechanisms. The conversation highlights the importance of understanding these shifts for insights into the properties of organic molecules.

PREREQUISITES
  • Fluorescence spectroscopy principles
  • Vibrational state relaxation mechanisms
  • Quantum dot properties and behavior
  • Chemical environment effects on fluorescence
NEXT STEPS
  • Research the mechanisms behind Stokes shifts in quantum dots
  • Explore thermal relaxation processes in fluorescence spectroscopy
  • Study the impact of chemical environments on fluorophore behavior
  • Review recent publications on Stokes shift design strategies
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Chemists, physicists, and researchers in materials science focusing on fluorescence spectroscopy and the analysis of organic molecules.

RYANDTRAVERS
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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?
 
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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:

http://pubs.acs.org/doi/abs/10.1021/jp404170w
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4472661&abstractAccess=no&userType=inst
http://www.sciencedirect.com/science/article/pii/S1010603010003631
 

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