含载流子基团的蓝色磷光铱配合物的合成及发光性能研究

Abstract

Based on conventional high-efficiency blue-emitting di[2-(2,4-diflurophenyl) pyridine-N,C2](piconilic acid) iridium(III) (FIrPic), novel iridium complexes FIr(G-Pic) with donor (D)-acceptor (A) and A-D-A structures were synthesized and characterized by 1H NMR, 13C NMR and element analysis, in which G-pic is picolinic acid derivative containing carrier-transporting groups by a non-conjugated connection of 1,6-dioxyhexane. Moreover, their thermal properties, electrochemical properties and photophysical properties were investigated. These iridium complexes displayed an identical blue emission peak at 472 nm. The results show that there is little influence on the photoluminescent spectra of the iridium complexes as the carrier groups were introducted into the ligand of FIrPic by non-conjugated connection. In contrast, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy levels were elevated about 0.1 eV. This indicates that much more effects were taken into the electrochemical properties of these iridium complexes. At the same time, the thermal stabilities of these iridium complexes were also improved, and their onset degradation temperatures ( T d) for 5% weight loss are higher than 250 °C.