Quantum yield: fluorescence spectrum correction

In summary, the conversation discussed issues with fluorescence spectral corrections. It was mentioned that the correction file does not initiate in the lower range, resulting in low intensity spectra that cannot be used for quantum yield determinations. It was also noted that there is no straightforward way to correct these spectra after the fact, and the best solution is to ensure the correction file is working properly during measurements. Using a different instrument or method may be necessary if the issue persists.
  • #1
amattiol
8
0
Hello,
I hope all is well, I have a few questions regarding fluorescence spectral corrections. I have run into an issue with corrections on the instrument I'm using. I have obtained spectra for a few compounds where the correction was working properly and achieve the results as expected. When I shift the emission scanning range down to around 280nm to 450nm, the correction file does not initiate - an error tells me this. This results in a very low intensity spectrum which in turn can not be used for quantum yield determinations by the reference method; I believe this is correct.

I wasn't aware of this issue until recently, is there a way to correct these spectra after the fact?
Any help would be greatly appreciated.
 
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  • #2
Unfortunately, there is no straightforward way to correct fluorescence spectra after the fact. You may be able to use a combination of software tools and manual data adjustment techniques to make some corrections, but this is not necessarily reliable. The best way to ensure accurate spectral corrections is to make sure the correction file is working properly when taking the measurements. If you are unable to get it to work properly in the lower range, you may need to switch to a different instrument or use a different method for collecting the data.
 

1. What is quantum yield and why is it important in fluorescence spectrum correction?

Quantum yield is a measure of how efficiently a molecule can convert absorbed light into fluorescence. It is important in fluorescence spectrum correction because it is used to correct for the differences in fluorescence intensities between different samples, allowing for more accurate comparison and analysis of fluorescence data.

2. How is quantum yield calculated?

Quantum yield is calculated by dividing the number of photons emitted by a molecule by the number of photons absorbed. This can be done using specialized equipment such as a fluorometer or by comparing the fluorescence of a sample to a standard with a known quantum yield.

3. What factors can affect quantum yield?

Quantum yield can be affected by a variety of factors including the chemical structure of the molecule, the solvent environment, temperature, and the presence of other molecules that can interact with the fluorophore. Additionally, the wavelength and intensity of the excitation light can also impact quantum yield.

4. How does fluorescence spectrum correction improve data analysis?

Fluorescence spectrum correction improves data analysis by accounting for variations in fluorescence intensity caused by factors such as sample concentration, instrument sensitivity, and experimental conditions. This allows for more accurate and reliable comparisons between samples and more precise measurement of fluorescence properties.

5. Are there any limitations to quantum yield as a measure of fluorescence efficiency?

Yes, there are limitations to quantum yield as a measure of fluorescence efficiency. It assumes that all absorbed photons are converted into fluorescence, which may not always be the case. Additionally, the measurement of quantum yield can be influenced by experimental conditions and may not accurately reflect the true fluorescence efficiency of a molecule under different conditions.

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