论文部分内容阅读
利用2-苯基吡啶及其衍生物为主配体、四苯基膦酰亚胺为辅助配体合成了3个铱配合物Ir(ppy)2tpip(Hppy:2-苯基吡啶,Htpip:四苯基膦酰亚胺)、Ir(npy)2tpip(Hnpy:2-(1-萘基)吡啶)和Ir(pnpy)2tpip(Hpnpy:2-(9-菲基)吡啶)。它们的结构通过1H NMR和MALDI-TOF质谱进行了表征,其中配合物Ir(ppy)2tpip还进一步通过晶体结构分析验证。主配体从苯环到萘环和菲环的改变增加了配合物的π共轭,减小了能级差,导致了3种配合物的磷光发射光谱从516 nm红移到600和633 nm(从绿光到红光),发光量子效率也从0.36增加到0.51和0.53。从量化计算的结果可以看出,这种共轭效应增加了主配体的电子密度,提高了配合物的LUMO能级。配合物结构和发射性质之间的关系规律为设计不同发光颜色的铱配合物提供了思路。
Three iridium complexes Ir (ppy) 2tpip (Hppy: 2-phenylpyridine and Htpip: tetrakis (2-phenylpyridine)) were synthesized using 2-phenylpyridine and its derivatives as the ligands and tetraphenylphosphinimide Phenylphosphonimide), Ir (npy) 2tpip (Hnpy: 2- (1-naphthyl) pyridine) and Ir (pnpy) 2tpip (Hpnpy: 2- (9-phenanthryl) pyridine). Their structures were characterized by 1H NMR and MALDI-TOF mass spectra. The complex Ir (ppy) 2tpip was further confirmed by crystal structure analysis. The change of the main ligand from the benzene ring to the naphthalene ring and the phenanthrene ring increased the π-conjugation of the complex and decreased the energy difference, which led to the red shift of the phosphorescence spectra of the three complexes from 516 nm to 600 and 633 nm From green to red), the quantum efficiency of light emission also increased from 0.36 to 0.51 and 0.53. It can be seen from the results of the quantitative calculation that this conjugation effect increases the electron density of the host ligand and increases the LUMO level of the complex. The relationship between the structure of the complex and the emission properties provides an idea for designing iridium complexes with different emission colors.