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Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes

机译：铱（III）复合芯对溶液加工有机发光二极管性能的影响

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摘要

Iridium( III ) complexes are the most frequently applied commercialized green and red emitters for organic light emitting diode (OLED) displays. Throughout years a significant research effort has been devoted to modify these compounds, in order to make them suitable for cost-effective solution-processing techniques, such as inkjet printing. To achieve this, the inherent tendency of the complex molecules to form poorly emissive aggregates needs to be suppressed. In many cases this has been achieved by an encapsulation of the iridium( III ) complex core with dendritic structures, composed of either passive or charge-transporting fragments. In order to validate this approach, we acquired three structural analogues of the conventional green emitter Ir(ppy) _(3) , which possess gradually increasing sterical encumberment at the complex surface. Corresponding OLEDs were examined, with three distinctively different active emissive layer compositions in terms of charge transportation characteristics. The results show that in the all scenarios the unmodified Ir(ppy) _(3) outperforms the compounds with attached bulky groups. The in-device performance of the emitter is directly related to its charge trapping ability, which is being compromised in the presence of dendritic auxiliary substituents.
机译：铱星（III）复合物是用于有机发光二极管（OLED）的最常应用的商业化绿色和红色发射器。在整个年内，致力于改变这些化合物的重要研究努力，以使它们适用于经济高效的解决方案加工技术，例如喷墨印刷。为此，需要抑制复杂分子形成差的发射骨料的固有趋势。在许多情况下，这已经通过用树枝状结构的铱（III）复合芯的封装来实现，该树枝状结构由无源或电荷输送碎片组成。为了验证这种方法，我们获得了传统的绿色发射器IR（PPY）_（3）的三种结构类似物，其具有逐渐增加在复杂表面处的立即缠绕。检查相应的OLED，在电荷运输特性方面具有三种明显不同的主动发光层组合物。结果表明，在所有场景中，未修饰的IR（PPY）_（3）优于附着笨重组的化合物。发射器的设备内部性能与其电荷捕获能力直接相关，这在树突辅助取代基存在下受到损害。

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