Use Raman microscope to measure quantum yield

Therefore, comparing the absolute intensity of emission peaks from two films with different thicknesses would not accurately reflect their quantum yield. In summary, The quantum yield of a film cannot be compared by dividing the absolute intensity of each emission peak by the film thickness, as the thickness does not determine the efficiency of the process but rather the number of molecules that can be excited.
  • #1
Yinxiao Li
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We have a Renishaw inVia confocal Raman microscope. Currently I am using it to study photoluminescence. I have a very thin film with certain thickness (e.g. 60nm and 120nm). It turns out that they (60nm and 120nm) have different emission spectra. Here comes the question:
Can I divide the absolute intensity of each emission peak by the film thickness to compare the quantum yield of these two films? This is quite intuitive but I guess it may not be correct. But why?
 
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  • #2
No, you cannot divide the absolute intensity of each emission peak by the film thickness to compare the quantum yield of two films. This is because the quantum yield of a film is determined by its intrinsic properties, such as its molecular composition and structure, rather than its thickness. The thickness of a film only determines the number of molecules that can be excited and thus the amount of light emitted, but not the efficiency of the process.
 

1. What is a Raman microscope?

A Raman microscope is a scientific instrument that uses Raman spectroscopy to analyze the chemical composition and structure of a sample. It works by shining a laser on the sample and measuring the scattered light to determine the molecular vibrations and identify the chemical bonds present.

2. How does a Raman microscope measure quantum yield?

A Raman microscope can measure quantum yield by using a technique called Raman mapping. This involves collecting Raman spectra from multiple points on the sample, and then comparing the intensity of the Raman signals to the laser power used. The ratio of these two values can determine the quantum yield of the sample.

3. What is quantum yield and why is it important?

Quantum yield is a measure of how efficiently a molecule can convert absorbed energy into a desired reaction or process. It is important because it can give insight into the efficiency of a chemical reaction or the performance of a material, which is useful for various fields such as materials science, environmental science, and chemistry.

4. Can a Raman microscope measure quantum yield for all types of samples?

No, a Raman microscope may not be suitable for measuring quantum yield in all types of samples. The technique is most effective for solid or liquid samples that have strong Raman scattering signals. Samples with weak or no Raman signals may not be suitable for quantum yield measurements with a Raman microscope.

5. What are the advantages of using a Raman microscope to measure quantum yield?

Using a Raman microscope to measure quantum yield offers several advantages. It is a non-destructive technique, meaning the sample remains intact after measurement. It also has high sensitivity, allowing for the detection of small changes in quantum yield. Additionally, Raman mapping can provide spatial information, making it useful for studying variations in quantum yield across a sample.

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