Undergraduate Thesis Or Project
 

Implementation of a comparative method for measuring photoluminescence quantum yield of novel compounds in solution

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  • Quantum yield is an important, characteristic quantity to be measured for fluorescent compounds. Here, a comparative method between fluorescent compounds in solution is applied to measure unknown quantum yields. An absorption spectrometer was used to measure the absorbances of two different fluorescent quantum yield standards. The integrated fluorescence intensities were obtained using a double monochromator and plotted against the corresponding absorbances, resulting in two calibration curves. The fluorescence quantum yields of cresyl violet and fluorescein calculated via these curves were 0.55±0.02 and 0.77±0.01, respectively. These are within 2.7% and 2.9% of their respective literature values. The quantum yields of zinc-oxide(ZnO) microspheres and Anthradithiophenetriethylsilylethynyl-fluorine(ADT-TES-F) in solution were also measured. The results for the ZnO microspheres were inconclusive, but the ADT-TES-F trial gave a fluorescence quantum yield of 0.44. The implementation of this method allows for the easy measurement of quantum yields with reasonable accuracy in the future.
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