The Multi-dimensional Charge Transport Groups Modified The Design, Synthesis And Photoelectric Properties Of Iridium Complexes

Due to metal organic complex represented by the iridium complexes as phosphorescent materials that can simultaneously use singlet exactions and triplet exactions in mixed light, so its internal quantum efficiency can reach 100% theoretically, thus becoming the focus of study. This paper will research the organic iridium complex as the subject, and propose the design ideas that multi-dimensionally modify the light-emitting core involving the charge transporting group and flexible group, so the light-emitting core is well packaged and can improve the carrier injection and transporting capacity. Moreover, due to the introduction of the alkyl chain, the solubility of the material becomes better and provides a new way to process the non-doped iridium complexes.1. The two-dimensional charge transport group are designed and synthesized to modify the iridium complexes IrPBIC₂, IrPBICO, IrPBIO₂. Through the research, I found that the performance of device is improved through eliminating the electron transport oxadiazole group and increasing the hole transport carbazole groups. Among them, the solution process of non-doped devices IrPBIC₂ did the best performance with its maximum brightness, luminance efficiency, power efficiency and external quantum efficiency reaching 3842 cd/m², 4.54 cd/A, 2.99 lm/W and 1.28% respectively.2. The four-dimensional charge transport group are designed and synthesized to modify the iridium complexes IrPBIC4, IrPBIC₂O₂, IrPBIO4. The research found that the performance of solution process device of IrPBIC4 also enhanced as its modification sites increased. Among them, the IrPBIC4 did the best performance of all non-doped devices with its starting voltage at 4.5 V, maximum brightness at 7783 cd/m2, brightness efficiency, power efficiency and external quantum efficiency reaching 19.6 cd/A, 11.3 lm/W and 5.8% respectively. The comprehensive performance can be equal with device constituted by PVK and IrPBIC4 as light-emitting layer. These proves that the method of the charge transport groups and flexible groups mixe multi-dimensional modification can effectively block the interaction between light-emitting centers, thereby reducing the concentration quenching and triplet annihilation effects...