Relationship between photoluminescence intensity and Absroption Intensity

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SUMMARY

The discussion focuses on the relationship between photoluminescence (PL) intensity and absorption intensity in transition metal oxide nanostructures. It is established that PL intensity significantly increases with decreasing nanostructure size, while absorption intensity shows minimal variation. The complexity of PL is highlighted, indicating that it does not necessarily correlate with absorption intensity due to various influencing factors, including the type of nanostructures and their optical properties.

PREREQUISITES
  • Understanding of photoluminescence (PL) and absorption spectroscopy
  • Knowledge of transition metal oxide nanostructures
  • Familiarity with quantum dots and quantum wells
  • Basic principles of optical activity and density of states
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  • Research the spectral dependence of photoluminescence in semiconductor nanostructures
  • Explore the optical properties of transition metal oxides
  • Learn about the effects of nanostructure size on PL and absorption characteristics
  • Investigate the relationship between band gap energy and photoluminescence intensity
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Researchers in materials science, physicists studying optical properties of nanostructures, and anyone involved in the development of semiconductor technologies.

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I have measured photoluminescence (PL) and light absroption spectra of some transtion metal oxide nanostructures. The PL intensity increases remarkably by decreasing the size of nanostructures. However, the intensity of absorption vary litte. Is there any relationship between the PL intensity and absroption intensity?. If PL intensity increase sharply then is it necessary that absorption instensiy should also increase sharply?
 
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The short answer is: PL is more complex than absorption. Absorption is in first approximation a measure of the density of states at some energy and their optical activity (typically in terms of a dipole moment). PL is more complex as it can show a complex dependence on the interplay between several nanostructures and may depend on many factors.

So you need to clarify: What are your structures? Quantum dots? Quantum Wells? Something else? Are they semiconductors or insulators? Which wavelength range are you checking? Is it near the band gap (if present)? What is the spectral dependence of your PL? And so on...
 

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