Photophysical and liquid crystalline properties (Platinum (II) complexes) and luminescent properties of third-row metal complex
Date Issued
2009
Date
2009
Author(s)
Wang, Kang-Wei
Abstract
In this thesis, I would divide into 5 chapters. In the 1st chapter, photophysic and photochemistry will be introduced. In addition, several calculation methods, which are used in the following chapters, such a Q.Y., lifetime, kr, and knr…etc, would be listed. In chapter 2, in the beginning, I would summarize the OLED history, progress, and recent development. The rest of this chapter would focus on the transition of OLED emitter material, such as LLCT (ligand-to-ligand charge transfer), MLCT (metal-to ligand charge transfer)…etc, and the methodology of tuning the Quantum Yield (Q.Y.), lifetime, kr, and knr by using different substituent, ligand, trans effect, and ancillary ligand. In chapter 3, by comparing the Mono- versus Di- nuclear PtII 6-(5-Trifluoromethyl-Pyrazol-3-yl)-2,2’-Bipyridine, I would further discuss about the metal-metal –to-ligand charge transfer (MMLCT) transition which happens in the di-nuclear PtII complex. This transition is tuned by modify the intramolecular Pt- Pt distance, and the results are well-correlated to the X-ray analysis and theoretical computation. In chapter 4, Ir metal complex with special Ir-H bond will be discussed. We can use the Raman spectra, X-ray analysis, and theoretical computation to prove the Trans effect does happen. So we can take the advantage of Tran’s effect to enhance to Trans position Ir-ligand bond in order to increase/decrease the MLCT % and the ligand field strength. The final chapter, by using 2-pyridyl pyrazole Family Ligands as chromophore, long carbon chain, Pt metal complex with liquid crystal property is discovered. The emission peak maximum is around 510 (nm). Furthermore, by comparing the different kr in solution, neat films, and Host/Guest system, the degree of aggregation are understood. In this case, the Pt-Pt interaction can be enhanced by the lager ππ stacking and increase of Van Der Waal force.
Subjects
liquid crystalline
Platinum (II) metal complex
Type
thesis
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