Origin and Control of Orientation of Phosphorescent and TADF Dyes for High‐Efficiency OLEDs,Advanced Materials

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Origin and Control of Orientation of Phosphorescent and TADF Dyes for High‐Efficiency OLEDs
Advanced Materials ( IF 27.4 ) Pub Date : 2018-04-30 , DOI: 10.1002/adma.201705600
Kwon-Hyeon Kim ₁ , Jang-Joo Kim ₁

Affiliation

It has been known for decades that the emitting dipole orientation (EDO) of emitting dyes influences the outcoupling efficiency of organic light‐emitting diodes (OLEDs). However, the EDO of dopants, especially phosphorescent dopants, has been studied less than that of neat films and polymer emitting layers (EMLs) due to the lack of an apparent driving force for aligning the dopants in amorphous host films. Recently, however, even globular‐shaped Ir complexes have been reported to have a preferred orientation in doped films and OLEDs. External quantum efficiencies (EQEs) higher than 30% have also been demonstrated using phosphorescent and thermally activated delayed fluorescent dyes (TADF) doped in EMLs. Here, recent results on the EDO of phosphorescent and TADF dyes doped in host films, and highly efficient OLEDs using these dyes are reviewed. The origin and control of the orientation of phosphors are discussed, followed by a discussion of future strategies to achieve EQEs of over 60% without a light extraction layer, from the material point of view.

中文翻译：

高效OLED的磷光和TADF染料取向的起源与控制。

数十年来，已知发光染料的发射偶极子方向（EDO）影响有机发光二极管（OLED）的输出耦合效率。然而，由于缺乏明显的驱动力来使非晶态主体膜中的掺杂剂取向，因此对掺杂剂，尤其是磷光掺杂剂的EDO的研究少于纯膜和聚合物发射层（EML）的EDO。然而，最近，据报道，即使球形的Ir配合物在掺杂的薄膜和OLED中也具有较好的取向。使用掺杂在EML中的磷光和热活化延迟荧光染料（TADF），也已经证明了高于30％的外部量子效率（EQE）。在此，综述了主体膜中掺杂的磷光和TADF染料的EDO的最新结果，以及使用这些染料的高效OLED。

更新日期：2018-04-30

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