Synthesis And Application Of 4, 6-Disubstituted Pyrimidine Iridium(Ⅲ) Complexes

There are more than thirty years since we pay attention to the O LEDs, but how to improve their efficiency is a difficult problem now. Recently, more and more people accept that efficient electron and hole injection/transport from the cathodes and anodes. When synthesis electroluminescent(EL) materials, their luminescence property and electron and hole-transporting ability are both concerned. Given the high electron affinities, pyrimidine derivatives have attracted a large of people to study, because they have many advantages, such as high photoluminescence(PL) quantum yield, good thermal and chemical stabilities, and good candidates for electron injection and transport. Mean while, the pyrimidine derivatives iridium(Ⅲ) complexes can act as host materials. So a lot of pyrimidine derivatives iridium(Ⅲ) complexes have been successfully synthesized and characterized, and applied as EL materials for OLEDs.1. Pyrimidine iridium(Ⅲ) complexes containing difluorophenyl groups: synthesis, photo-physical properties and applications.A series of iridium(Ⅲ) complexes bearing 4, 6-dichloro-pyrimidine and 2, 4- difluorophenyl-boric acid have been successfully synthesized and characterized(called DPFIrpic, DPFIr TP, PPFIrpic, PPFIr TP, DBPFIrpic, DBPFIr TP). Considering to make their maximum wave length blue shifted, DPFPOIrpic and DPFPOIr TP are synthesized too. Their structures are confirmed by 1H NMR, 13 C NMR, MODI-TOF and so on. Their characterizations are measured by UV, PE and electric chemistry. Complex PPFIr TP is effectively blue shift by introducing piperidine than any other complexes, because the piperidine has the largest electron-withdrawing. Iridium(Ⅲ) complexes DPFIrpic, PPFIr TP, DBPFIrpic, and DBPFIr TP are all made of O LEDs to realize their applications. The structure is ITO/PEDO T: PSS/(70% PVK : 30% OXD-7): X wt% DPFIrpic, PPFIr TP, DBPFIrpic, or DBPFIr TP /TPBI/Ca/Ag. We chose DPFIrpic, DPFIr TP, DBPFIrpic, DBPFIr TP as the doping materials to get OLEDs. Finally, DBPFIr TP get the best properties. The highest luminance is 30619 cd/m2, EL efficiency is 19.3 cd/A. And the rool-off value is 0.5%. It has the most stable property.2. 4, 6-diphenyl Pyrimidine iridium(Ⅲ) complexes: synthesis, photo-physical properties and applications.A series of iridium(Ⅲ) complexes bearing 4, 6-dichloro-pyrimidine and phenyl-boric acid have been successfully synthesized and characterized(called(dpp)2Ir(dta),(dpp)2Ir(pic),(dpp)2Ir TP). Their structures are confirmed by 1H NMR, 13 C NMR, MODI-TOF and so on. Their physical properties are charactered by UV, PE and electric chemistry. They have the same cyclometalated ligand, but their maximum wave lengths are from 532 nm to 575 nm. So ligands have the largest influence to their properties. Finally, the three iridium(Ⅲ) as the doping materials made the O LEDs to investagate their applications. The structure is ITO/PEDOT: PSS/(70% PVK : 30% OXD-7): X% wt(dpp)2Irdta,(dpp)2Irpic and(dpp)2Ir TP/TPBI/Ca/Ag. Finally,(dpp)2Ir TP reaches the best properties. Its maximum current density is 1029.15 m A/cm2, luminance is 125072 cd/cm2, EL efficiency is 40.4 cd/A and EQ E is 17.82%. They all have slow roll-offs f. So their EL properties are very stable.