Liquid crystalline materials possess great potential as emitters in organic light‐emitting diodes (OLEDs) due to their self‐assembling property, which may lead to anisotropic films and improved charge transport. Here, the key photophysical properties of the columnar liquid crystalline emitter perylene‐3,4,9,10‐tetracarboxylic tetraethyl ester (PTCTE) are investigated and the material is implemented into OLEDs. It is found that vacuum‐deposited PTCTE films exhibit preferential horizontal orientation of the transition dipole moment. Embedding the emitter into different host materials leads to increased photoluminescence quantum yield but reduces molecular orientation compared to the neat film. OLEDs containing PTCTE doped into an exciplex‐forming co‐host achieve very high luminance exceeding 10 000 cd m⁻² at 5.7 V, which is among the best performances of OLEDs based on columnar liquid crystalline emitters reported so far.

中文翻译：

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基于柱状液晶Per发光体的有机发光二极管

液晶材料具有自组装特性，因此在有机发光二极管（OLED）中具有作为发射器的巨大潜力，这可能会导致各向异性薄膜并改善电荷传输。在此，研究了柱状液晶发射体per-3,4,9,10-四羧酸四乙酯（PTCTE）的关键光物理性质，并将该材料应用于OLED。发现真空沉积的PTCTE薄膜表现出过渡偶极矩的优先水平取向。与纯膜相比，将发射器嵌入不同的主体材料中可以提高光致发光的量子产率，但会降低分子的取向。掺入激基复合物共基质的含PTCTE的OLED可获得非常高的亮度，超过10000 cd m ^-2 在5.7 V下，这是迄今为止报道的基于柱状液晶发射器的OLED的最佳性能之一。