揭示了FIrpic基蓝光OLED的降解机理：II。在界面处捕获和检测分子
Unraveling the degradation mechanism in FIrpic based Blue OLEDs: II. Trap and detect molecules at the interfaces
摘要：
有机发光二极管（OLED）在现代生活中的影响是通过其在全彩色，节能，平板显示器和智能屏幕中的广泛应用来证明的;在固态照明领域也有光明的前景。环化铱配合物是OLED中最常用的磷光发光体，这是由于它们广泛可调的电致物理性质和它们的通用合成。发蓝光的OLED遭受阻碍其长期稳定性的固有不稳定性问题。在计算研究的支持下，在这项工作中，我们研究了天蓝色发射体FIrpic在非原位和原位降解实验结合互补，相互独立，实验包括化学复分解反应，在液相和固态，热和光谱研究和LC-MS调查。我们开发了一种简单的方案来评估铱络合物中的降解途径，发现FIrpic通过失去吡啶甲酸酯辅助配体而降解。所得的铱片段随后作为BPhen衍生物1被有效地“原位”捕获。当适当设计的基于FIrpic的OLED被操作和老化时，发现该过程被很好地反映。在本文中，我们（i）描述了如何能够有效地研究OLED材料与一个小的一组容易获得的实验和（ii）证据的中心作用的捕获实验中的主机矩阵。
英文摘要：
The impact of organic light emitting diodes (OLEDs) in modern life is witnessed by their wide employment in full-color, energy-saving, flat panel displays and smart-screens; a bright future is likewise expected in the field of solid state lighting. Cyclometalated iridium complexes are the most used phosphorescent emitters in OLEDs due to their widely tunable photophysical properties and their versatile synthesis. Blue-emitting OLEDs, suffer from intrinsic instability issues hampering their long term stability. Backed by computational studies, in this work we studied the sky-blue emitter FIrpic in both ex-situ and in-situ degradation experiments combining complementary, mutually independent, experiments including chemical metathesis reactions, in liquid phase and solid state, thermal and spectroscopic studies and LC-MS investigations. We developed a straightforward protocol to evaluate the degradation pathways in iridium complexes, finding that FIrpic degrades through the loss of the picolinate ancillary ligand. The resulting iridium fragment was than efficiently trapped "in-situ" as BPhen derivative 1. This process is found to be well mirrored when a suitably engineered, FIrpic-based, OLED is operated and aged. In this paper we (i) describe how it is possible to effectively study OLED materials with a small set of readily accessible experiments and (ii) evidence the central role of host matrix in trapping experiments.
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