| In order to obtain the excellent OEL material with good electron transportability and efficient emission, five new kinds of Eu(III) complexes have been synthesized in this thesis. Their structure characters and photophysical properties were also fully described. Based on the study of the photoluminescence of the complexes, we measured the electroluminescence of some of them preliminarily, and gained the significative results as regards their electron-transporting and luminous quantum efficiency.1. The first coordinating ligand, N-(5-Phenyl-[1,3,4]oxadiazol-2-yl)-benzamide(Li), and the neutral ligand, 2,2'-(1,3,4-oxadiazole-2,5-diyl)-dis-pyridine(ODP), have been synthesized. And three Eu(III) complexes with acylamide as the first ligand, Eu2(L1)6(H2O)2, Eu(L,)3(PHEN) and Eu2(L,)6Na2(OH)2(ODP)2, have been obtained. The X-ray diffraction results prove that L! coordinates with Eu(III) ion by the oxygen atom from the carbonyl group in the enol form, and the nitrogen atom from the oxadiazol group. The coordination polyhedron of the Eu(III) ion is the distorted square antiprismatic. Eu2(Li)e(H2O)2 and Eu2(Li)6Na2(OH)2(ODP)2 are all the dimeric with two Eu(III) ions bridged by two oxygen atoms. The photoluminescence of them all shows the characteristic emission of the Eu(III) ion. These all illustrate that LI can sensitize the luminescence of the Eu(III) ion.2. With the good electron-transporting complex, Zn(Salen), as the second ligand, the bimetallic complex, Eu(TTA)3Zn(Salen), has been synthesized. According to the structure analysis results, The Zn( II) and the Eu(III) are bridged by the two oxygen atoms of the phenolic group. Although Zn(Salen) can emit blue fluorescence, the emission spectra of Eu(TTA)3Zn(Salen) only shows the characteristic emission of the Eu(III) ion, without any trace of Zn(Salen) emission, which illustrates that the efficient energy transfer from Zn(Salen) moiety to Eu(III) ion. Eu(TTA)3Zn(Salen) shows the characteristic emission of the Eu(III) ion.3. We have synthesized a series of 4,5-diaza-9-aroma imino fluorene, and thecorresponding Eu(III) complexes with them as the second ligand and DBM as the first ligand. The single crystals of some of them were measured by X-ray diffraction. The result shows that the complexes become the chiral Structure with the neutral ligand. At the same time, the luminescence of this series of the complexes is quenched because of the neutral ligand.4. A novel organic compound with the ability of electron- transporting and hole-blocking, 2,6-Bis-(5-methyl-[l,3,4]oxadiazol-2-yl)-pyridine(BMOP), has been synthesized. And we obtained four complexes, Eu(DBM)3(BMOP), Eu(NTA)3(BMOP), Eu(BA)3(BMOP) and Eu(TTA)3(BMOP), with BMOP as the neutral ligand. The relation between the luminous property of the complexes and their structure was systemically discussed. Eu(DBM)3(BMOP) and Eu(NTA)3(BMOP) emit more intense red fluorescence, compared with Eu(DBM)3(H2O)2 and Eu(NTA)3(H2O)2. According to the excitation spectra of these complexes, we deduce that BMOP can be a good sensitizer of Eu(III) ion by transporting the absorbed energy to the first ligand. The electroluminescence shows that BMOP have the character of electron-transporting and hole-blocking.5. Choosing 2,2'-(l,3,4-oxadiazole-2,5-diyl)-dis-pyridine(ODP) as the second ligand, the complexes, Eu(DBM)3(ODP) and Eu(NTA)3(ODP), have been synthesized. And their character of electron-transporting and hole-blocking has been measured. The maximum luminance of the device (ITO/TPD(20nm)/Eu(DBM)3(ODP)(30nm)/AlQ3 (5nm)/BCP(5nm)/Mg:Ag) is 42cd/m2. |
