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首页> 外文期刊>Molecular Crystals and Liquid Crystals >Effects of Symmetry of Ir (III) Complex on the Photophysical Properties and Device Performances
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Effects of Symmetry of Ir (III) Complex on the Photophysical Properties and Device Performances

机译：Ir（III）配合物的对称性对光物理性质和器件性能的影响

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摘要

The optical, electrochemical properties of two isomers of Ir(mpp)2acac (mpp = anion of 3-methyl-2-phenyl-pyridine and acac = acetylacetonate) and the device performance of polymer light emitting devices using two isomers as a triplet emitter have been studied. The two isomers show the symmetric and asymmetric coordination of two mpp ligands to Ir(III), which is confirmed from the 1H NMR spectra. The ligand based absorption is red shifted by 35 nm in asymmetric Ir(mpp)2acac compared to the symmetric Ir(mpp)2acac. The MLCT absorption peak positions are similar in both cases, but the extinction coefficients of the asymmetric Ir(mpp)2acac are higher than those of symmetric Ir(mpp)2acac. The two isomers exhibit similar PL emission spectra but PL lifetimes of two isomers are different. The lifetime of the symmetric Ir(mpp)2acac is 1.74 μs, whereas that of the asymmetric Ir(mpp)2acac is 0.9 μs. The asymmetric Ir(mpp)2acac shows higher electrochemical oxidation potential than that of the symmetric Ir(mpp)2acac. The polymer light emitting devices are fabricated by blending 8 wt% of Ir(mpp)2acac in the PVK. The polymer light emitting device with symmetric Ir(mpp)2acac shows a maximum external quantum efficiency (ηext) of 0.48% at 73 mA/cm2 and a luminance of 12,300 cd/m2. The polymer light emitting device with asymmetric Ir(mpp)2acac shows a maximum external quantum efficiency of 0.32% at 100 mA/cm2 and a luminance of 7,500 cd/m2. This results show that the symmetry of metal complex can affect the photophysical properties as well as the device performance.
机译：Ir（mpp） 2 acac的两种异构体的光学，电化学性质（mpp = 3-甲基-2-苯基吡啶的阴离子，acac =乙酰丙酮酸）和聚合物发光器件的器件性能已经研究了使用两种异构体作为三线态发射体。这两个异构体显示两个mpp配体与Ir（III）的对称和不对称配位，这是通过 1 H NMR光谱证实的。与不对称的Ir（mpp） 2 acac相比，不对称的Ir（mpp） 2 acac中基于配体的吸收红移了35 nm。两种情况下的MLCT吸收峰位置相似，但不对称Ir（mpp） 2 acac的消光系数高于对称Ir（mpp） 2 acac的消光系数。两种异构体表现出相似的PL发射光谱，但是两种异构体的PL寿命不同。对称Ir（mpp） 2 acac的寿命为1.74μs，而非对称Ir（mpp） 2 acac的寿命为0.9μs。不对称的Ir（mpp） 2 acac的电化学氧化电位高于对称的Ir（mpp） 2 acac。通过将8 wt％的Ir（mpp） 2 acac掺入PVK中来制造聚合物发光器件。具有对称Ir（mpp） 2 acac的聚合物发光器件在73 mA / cm 2处显示0.48％的最大外部量子效率（Î ext ） ，亮度为12,300 cd / m 2 。具有不对称Ir（mpp） 2 acac的聚合物发光器件在100 mA / cm 2 下的最大外部量子效率为0.32％，亮度为7,500 cd / m 2 。该结果表明金属络合物的对称性会影响光物理性质以及器件性能。

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