We report on the study of a new family of neutral heteroleptic Ir(F2ppy)2L (F2ppy = 2-(2,4-difluorophenyl)pyridine) complexes bearing different triazole derivatives (L = 2-(1,2,3-triazol-5-yl)pyridine) as the third ligand. Two of these ligands were used for the first time as ancillary ligands in iridium(III) complexes. A full photophysical and electrochemical study of these complexes is reported here, together with theoretical investigations at the density functional theory (DFT) level. The complexes were also obtained as single crystals and their structures were determined by X-ray crystallography. The newly reported complexes exhibit blue emission with high quantum yields in solution. Photophysical results are also compared to those reported for their 1,2,4-triazole isomer analogues. The emitting state is a mixture between the triplet metal-to-ligand charge transfer (3MLCT) and triplet inter-ligand charge transfer (3ILCT) states, and it is more localized on the F2ppy ligand as supported by DFT calculations. In addition, this paper reports some preliminary tests of polymer light-emitting diodes (PLEDs) doped with these iridium complexes. The results indicate that such molecules are good candidates as blue- and green-emitting dopants in LED devices.
我们报告了一类新的中性异
配体Ir(F2ppy)2L(F2ppy =
2-(2,4-二氟苯基)吡啶)配合物的研究,这些配合物以不同的
叠氮衍
生物(L = 2-(1,2,3-
叠氮-5-基)
吡啶)作为第三
配体。其中两个
配体首次作为辅助
配体用于
铱(III)配合物。本文报告了对这些配合物的全面光物理和电
化学研究,以及在密度泛函理论(DFT)
水平上的理论研究。这些配合物也以单晶形式获得,并通过X射线晶体学确定了其结构。新报告的配合物在溶液中表现出蓝色发射,具有高量子产率。光物理结果还与其1,2,4-
叠氮异构体的相应数据进行了比较。发光态是在三重态
金属-
配体电荷转移(3MLCT)和三重态
配体间电荷转移(3ILCT)态之间的混合,DFT计算支持其更侧重于F2ppy
配体。此外,本文还报告了掺有这些
铱配合物的聚合物发光二极管(PLEDs)的初步测试。结果表明,这些分子是LED器件中蓝色和绿色发光掺剂的良好候选者。