Charge Transport in a Highly Phosphorescent Iridium(III) Complex-Cored Dendrimer with Double Dendrons
Charge Transport in a Highly Phosphorescent Iridium(III) Complex-Cored Dendrimer with Double Dendrons
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DOI：
10.1002/adfm.201101727
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发表时间：
2012-01-11
影响因子：
19
通讯作者：
Samuel, Ifor D. W.
中科院分区：
文献类型：
--
作者：
Gambino, Salvatore;Lo, Shih-Chun;Samuel, Ifor D. W.
报道了磷光铱（III）络合物核树枝状聚合物的电荷传输性质，其中两个树枝状分子连接到核的每个配体。结果表明，该材料在不影响电荷输运的情况下获得了较高的光致发光量子产率。空穴迁移率值报告在很宽的温度和电场范围内使用的电荷产生层的飞行时间技术。用高斯无序模型（GDM），相关无序模型，极化相关无序模型，和短程相关高斯无序模型的结果进行了分析。结果表明，GDM模型对该材料中的空穴输运过程给出了最全面的描述。尽管其较大的尺寸，双树枝化材料的空穴迁移率与较小的单树枝化材料的空穴迁移率相比是有利的，并且其球形形状导致低能量无序和明显的非分散电荷传输。这显示了分子形状如何被用来将有利的光致发光和电荷传输特性联合收割机结合起来。
The charge transporting properties of a phosphorescent iridium(III) complex-cored dendrimer, with two dendrons attached to each ligand of the core are reported. The results show that the high photoluminescence quantum yield of this material is obtained without compromising charge transport. The hole mobility values are reported over a wide range of temperatures and electric fields using the charge-generation layer time-of-flight technique. The results are analysed using the Gaussian disorder model (GDM), the correlated disorder model, the polaronic correlated disorder model, and the short-range correlated Gaussian disorder model. It is found that the GDM model gives the most comprehensive description of hole transport in this material. In spite of its larger size, the hole mobility of the doubly dendronised material compares favourably with that of a smaller singly dendronised material, and its spherical shape leads to low energetic disorder and clearly non-dispersive charge transport. This shows how molecular shape can be used to combine favourable photoluminescence and charge-transporting properties.