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

Synthesis and photophysical characterization of the blue-emitting iridium complexes with carrier-transporting groups

通过对传统高效蓝色磷光铱配合物二[2-(2,4-二氟苯基)吡啶-N,C2](2-吡啶甲酸)合铱(FIr Pic)的辅助配体进行修饰,得到了含载流子基团(三苯胺和口恶二唑)的蓝色磷光铱配合物FIr(G-Pic),其中G-Pic是含有载流子基团的吡啶甲酸衍生物,其结构通过核磁共振氢谱、碳谱和元素分析进行了表征.这些新型蓝色磷光铱配合物的热稳定性质、电化学性质和光物理性质研究表明,以非共轭方式在Fir Pic的辅助配体上引入载流子基团,对其发光光谱影响不大,它们在溶液中的最大发射峰为472 nm;但是对铱配合物的电化学性质有一定影响,它们的HOMO和LUMO能级均有约0.1 e V的提升;同时,铱配合物的热稳定性也进一步提升,其热分解温度均大于250℃.

Based on conventional high-efficiency blue-emitting di[2-（2,4-diflurophenyl） pyridine-N,C]（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 （Td） for 5% weight loss are higher than 250℃.