| Summary: | 碩士 === 輔仁大學 === 化學系 === 89 === ABSTRACT
In this thesis, we investigate energy transfer phenomena and quenching mechanisms in the emitting systems. In the first part, the effects of hydrogen bonding on energy transfer of QA molecules are studied. We use the Alq3 as the host and measure the emission spectra, the critical energy transfer distances, the energy transfer rates and the relative quantum yields of QA molecules in different concentrations and conditions. Some QA derivatives that can not form H-bonding are also studied in order to compare with the results of QA molecules. These studies are helpful in understanding the energy transfer phenomena of H-bonding molecules.
In the second part, we study the energy transfer of PD-1G and PDTE. While both compounds have high quantum yields, the efficiency of energy transfer from Alq3 is very poor. The absorption spectra of PD-1G and PDTE both significantly overlap with the fluorescence spectra of Alq3, and PD-1G and PDTE both get the energy from the Alq3. However, the fluorescence spectra reveal that PD-1G and PDTE do not emit the energy absorbed from the Alq3. Therefore we would like to find the reasons by exploring the lifetimes of the energy transfer processes, the critical energy transfer distances, and the energy transfer rates.
In the third part, we investigate cpd5’s quenching mechanisms upon adding different quenchers. The absorption and emission spectra, Stern-Volmer eq, and lifetime measurements are used in determining the quenching mechanism, dynamic or static, of cpd5.
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