Synthesis And Opto-electronic Properties Of Novel β-diketone Metal Complexes

β-diketone complexes have been used in many fields such as analytical chemistry, medicine, fluorescent probes, luminescence and so on. Especially in the light-emitting fields, various forms of β-diketone complexes have been synthesized. Dibenzoyl methane(DBM) has some advantages. For example, the Eu(III) complexes containing DBM display high photoluminescence(PL) and electroluminescence(EL) efficiency, and DBM derivatives can be easily synthesized.In this thesis, we have not only synthesized three new rare earth complexes(Gd(III), Tb(III) and Eu(III)) containing DBM and Cz-PBM ligands, but also two novel carrier transporting group-functionalized dibenzoylmethane ligands(DBM-Ox and DBM-Cz) were synthesized. Furthermore, two new iridium(III) complexes containing the coumarin derivatives as cyclometalated ligands(L) and DBM-Ox or DBM-Cz as ancillary ligands have been successfully synthesized and characterized.In the second chapter, we synthesized three rare earth metal complexes with DBM as the first ligand and Cz-PBM as the second ligand. The single crystal X-ray crystallography, UV-vis absorption and photoluminescence spectra of these complexes were investigated. The results show that Eu(DBM)3(Cz-PBM) emits strong red light, while complexes of Tb(DBM)3(Cz-PBM) and Gd(DBM)3(Cz-PBM) show the ligand Cz-PBM’s emission. The characteristic emission of Tb3+ ion 5D4 â†'7Fj energy transfer does not appear in the photoluminescent spectrum of the complex Tb(DBM)3(Cz-PBM). The result showed that the energy transfer from the triplet level of the ligand to the nenrgy of Tb3+ ion does not match, indicating that the ligands do not sensitize to the luminescednce of Tb3+ ion.In the third chapter, the iridium(III) complex containing the coumarin derivatives as cyclometalated ligands(L) and DBM-Ox as ancillary ligand was successfully synthesized and characterized by 1H NMR, IR, UV, PL and thermal gravimetric analysis. In order to study the electroluminescent properties of the complex Ir(L)2(DBM-Ox), the doped devices were fabricated, in which CBP was used as host material and Ir(L)2(DBM-Ox) used as dopant. Mass fraction is 5%, 8%, 10% and 12%, respectively. The EL emission peak of the device of doping Ir(L)2(DBM-Ox) located at 529 nm, and the performance of the device based on Ir(L)2(DBM-Ox) with a 10% doping concentration is better than that of other doped devices. The turn-on voltage is 6.7 V. When the voltage is 12.2 V, the maximum brightness is 3500 cd.m-2.In the fourth chapter, the iridium(III) complex containing the coumarin derivatives as cyclometalated ligands(L) and DBM-Cz as ancillary ligand was successfully synthesized and characterized. The electroluminescence devices using the complex Ir(L)2(DBM-Cz) as dopant were fabricated. Mass fraction is 5%, 8%, 10%, 12%, 15% and 18%, respectively. The EL emission peak of the device located at 531 nm, and the performance of the device based on Ir(L)2(DBM-Cz) with a 15% doping concentration is better than that of other doped devices. The turn-on voltage is 6.5 V. When the voltage is 11 V, the maximum brightness is 5100 cd.m-2.Both iridium complexexs show strong yellow-green light, and they are the promising OLEDs materials.