Concepts for the material development of phosphorescent organic materials processable from solution and their application in OLEDs

S. Janietz, H. Krueger, M. Thesen, B. Salert, A. Wedel
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Abstract

One example of organic electronics is the application of polymer based light emitting devices (PLEDs). PLEDs are very attractive for large area and fine-pixel displays, lighting and signage. The polymers are more amenable to solution processing by printing techniques which are favourable for low cost production in large areas. With phosphorescent emitters like Ir-complexes higher quantum efficiencies were obtained than with fluorescent systems, especially if multilayer stack systems with separated charge transport and emitting layers were applied in the case of small molecules. Polymers exhibit the ability to integrate all the active components like the hole-, electron-transport and phosphorescent molecules in only one layer. Here, the active components of a phosphorescent system – triplet emitter, hole- and electron transport molecules – can be linked as a side group to a polystyrene main chain. By varying the molecular structures of the side groups as well as the composition of the side chains with respect to the triplet emitter, hole- and electron transport structure, and by blending with suitable glass-forming, so-called small molecules, brightness, efficiency and lifetime of the produced OLEDs can be optimized. By choosing the triplet emitter, such as iridium complexes, different emission colors can be specially set. Different substituted triazine molecules were introduced as side chain into a polystyrene backbone and applied as electron transport material in PLED blend systems. The influence of alkyl chain lengths of the performance will be discussed. For an optimized blend system with a green emitting phosphorescent Ir-complex efficiencies of 60 cd/A and an lifetime improvement of 66.000 h @ 1000 cd/m2 were achieved.
溶液可加工磷光有机材料的材料开发概念及其在oled中的应用
有机电子学的一个例子是基于聚合物的发光器件(led)的应用。led在大面积和细像素显示、照明和标牌方面非常有吸引力。聚合物更适合通过印刷技术进行溶液处理,有利于大面积低成本生产。像ir -配合物这样的磷光发射体比荧光系统获得了更高的量子效率,特别是在小分子的情况下,如果应用具有分离电荷传输层和发射层的多层堆叠系统。聚合物具有将空穴、电子输运和磷光分子等所有活性组分集成在一层中的能力。在这里,磷光系统的活性组分——三重态发射体、空穴和电子传递分子——可以作为侧基连接到聚苯乙烯主链上。通过改变侧基的分子结构以及侧链的组成,以及三重态发射体、空穴和电子传递结构,并通过与合适的玻璃形成所谓的小分子混合,可以优化所生产的oled的亮度、效率和寿命。通过选择三重态发射体,如铱配合物,可以特别设置不同的发射颜色。将不同取代的三嗪分子作为侧链引入聚苯乙烯骨架中,作为电子传递材料应用于聚苯乙烯共混体系中。讨论了烷基链长度对性能的影响。优化后的混合系统中,绿色发光磷光ir复合物的效率为60 cd/ a,寿命提高了6.6万h @ 1000 cd/m2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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