Self-absorption correction for solid-state photoluminescence quantum yields obtained from integrating sphere...

Area of Science:

• Photochemistry
• Spectroscopy
• Materials Science

Background:

• Accurate quantum yield (QY) measurement is crucial for photoluminescent materials.
• Self-absorption can significantly skew QY results, especially in concentrated or highly absorbing samples.
• Existing methods often overestimate true QY due to uncorrected self-absorption effects.

Purpose of the Study:

• To develop a novel method for analyzing and correcting self-absorption in photoluminescence integrating sphere measurements.
• To accurately determine the self-absorption probability by considering emission, absorption, and reemission processes.
• To provide a more reliable QY determination, particularly for samples with high absorbance.

Main Methods:

• Utilized both observed quantum yield and luminescence spectrum data.
• Developed a model to calculate self-absorption probability.
• Incorporated initial emission, absorption, and reemission dynamics into the analysis.
• Experimentally validated the method using perylene red in a polymer film.

Main Results:

• The new method accurately quantifies self-absorption effects.
• Experimental validation confirmed the method's efficacy.
• Demonstrated improved QY determination compared to previous techniques.
• The approach is particularly beneficial for samples with high absorbance or high intrinsic QY.

Conclusions:

• The presented method offers a significant improvement for accurate photoluminescence quantum yield determination.
• It effectively corrects for self-absorption, leading to more reliable material characterization.
• This technique is essential for researchers working with photoluminescent materials exhibiting significant absorbance.