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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A comparative study of Ir(III) complexes with pyrazino[2,3-f][1,10]phenanthroline and pyrazino[2,3-f][4,7]phenanthroline ligands in light-emitting electrochemical cells (LECs)
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A comparative study of Ir(III) complexes with pyrazino[2,3-f][1,10]phenanthroline and pyrazino[2,3-f][4,7]phenanthroline ligands in light-emitting electrochemical cells (LECs)

机译:吡咯并[2,3-f] [1,10]菲咯啉和吡嗪并[2,3-f] [4,7]菲咯啉配体的Ir(III)配合物在发光电化学电池(LECs)中的比较研究

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We report the comparative study of the electrochemical and photoluminescent properties of two Ir(III) complexes described as [Ir(F(2)ppy)(2)(N<^>N)][PF6], where the F(2)ppy ligand is 2-(2,4-difluorophenyl)pyridine and the N<^>N ligands are pyrazino[2,3-f][1,10]phenanthroline (ppl) and pyrazino[2,3-f][4,7]phenanthroline (ppz). The complexes were used for the fabrication of light-emitting electrochemical cells (LECs). The structures of the complexes have been corroborated by X-ray crystallography. Theoretical calculations were performed to understand the photophysical behavior of the complexes. Both in solution and solid state, the photoluminescence spectra shows that emission is significantly red-shifted in the [Ir(F(2)ppy)(2)(ppz)][PF6] complex compared with the [Ir(F(2)ppy)(2)(ppl)][PF6] complex. Besides, the [Ir(F(2)ppy)(2)(ppl)][PF6] complex exhibits a higher quantum yield and a longer excited state lifetime than the [Ir(F(2)ppy)(2)(ppz)][PF6] complex; therefore, in the last case non-radiative decay is predominant due to the stabilization of LUMO orbital (energy gap law). In the fabrication of LEC devices with the [Ir(F(2)ppy)(2)(ppl)][PF6] complex, light emission was obtained with a maximum value of luminance equal to 177 cd m(-2), while in the case of the [Ir(F(2)ppy)(2)(ppz)][PF6] complex, no luminance was observed. According to the photophysical data, the performance in LEC devices could be explained by the different position of the nitrogens in the ppl and ppz structural isomers, electronically affecting the complex, and therefore its properties. In addition, from the crystallographic analysis it is possible to note that the [Ir(F(2)ppy)(2)(ppz)][PF6] complex shows enhanced intermolecular and intramolecular interactions compared with [Ir(F(2)ppy)(2)(ppl)][PF6], and consequently a higher ordering of the molecules in the complex with ppz ligand can be expected. This higher order could favour the quenching processes, and consequently enhance the non-radiative deactivation.
机译:我们报告了两种被描述为[Ir(F(2)ppy)(2)(N ^ N)] [PF6]的Ir(III)配合物的电化学和光致发光性质的比较研究,其中F(2) ppy配体是2-(2,4-二氟苯基)吡啶,N ^ N配体是吡嗪并[2,3-f] [1,10]菲咯啉(ppl)和吡嗪并[2,3-f] [4 ,7]菲咯啉(ppz)。该配合物用于制造发光电化学电池(LEC)。配合物的结构已经通过X射线晶体学证实。进行理论计算以了解络合物的光物理行为。无论是在溶液状态还是固态,光致发光光谱均表明,与[Ir(F(2))相比,[Ir(F(2)ppy)(2)(ppz)] [PF6]络合物中的发射显着红移。 ppy)(2)(ppl)] [PF6]复合物。此外,[Ir(F(2)ppy)(2)(ppl)] [PF6]络合物比[Ir(F(2)ppy)(2)(ppz)具有更高的量子产率和更长的激发态寿命)] [PF6]复合物;因此,在最后一种情况下,由于LUMO轨道的稳定(能隙定律),非辐射衰减是主要的。在制造具有[Ir(F(2)ppy)(2)(ppl)] [PF6]配合物的LEC器件时,获得的发光最大值为177 cd m(-2)。在[Ir(F(2)ppy)(2)(ppz)] [PF6]络合物的情况下,没有观察到亮度。根据光物理数据,可以通过ppl和ppz结构异构体中氮原子的不同位置来解释LEC装置的性能,这会以电子方式影响配合物,进而影响其性质。此外,从晶体学分析中可能会注意到,与[Ir(F(2)ppy) )(2)(ppl)] [PF6],因此可以预期具有ppz配体的复合物中分子的更高顺序。该更高的阶数可能有利于淬灭过程,并因此增强了非辐射失活。

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