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Ultrahigh-efficiency solution-processed simplified small-molecule organic light-emitting diodes using universal host materials

机译:使用通用主体材料的超高效溶液处理的简化小分子有机发光二极管

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摘要

Although solution processing of small-molecule organic light-emitting diodes (OLEDs) has been considered as a promising alternative to standard vacuum deposition requiring high material and processing cost, the devices have suffered from low luminous efficiency and difficulty of multilayer solution processing. Therefore, high efficiency should be achieved in simple-structured small-molecule OLEDs fabricated using a solution process. We report very efficient solution-processed simple-structured small-molecule OLEDs that use novel universal electron-transporting host materials based on tetraphenylsilane with pyridine moieties. These materials have wide band gaps, high triplet energy levels, and good solution processabilities; they provide balanced charge transport in a mixed-host emitting layer. Orange-red (~97.5 cd/A, ~35.5% photons per electron), green (~101.5 cd/A, ~29.0% photons per electron), and white (~74.2 cd/A, ~28.5% photons per electron) phosphorescent OLEDs exhibited the highest recorded electroluminescent efficiencies of solution-processed OLEDs reported to date. We also demonstrate a solution-processed flexible solid-state lighting device as a potential application of our devices.
机译:尽管小分子有机发光二极管(OLED)的溶液处理已被认为是需要高材料和处理成本的标准真空沉积的有前途的替代方法,但该器件的发光效率低且难以进行多层溶液处理。因此,在使用溶液法制造的结构简单的小分子OLED中应该实现高效率。我们报告了非常有效的溶液处理的简单结构的小分子OLED,它们使用基于具有吡啶部分的四苯基硅烷的新型通用电子传输主体材料。这些材料具有宽带隙,高三重态能级和良好的溶液可加工性。它们在混合主体发光层中提供了平衡的电荷传输。橘红色(〜97.5 cd / A,每个电子〜35.5%的光子),绿色(〜101.5 cd / A,每个电子〜29.0%的光子)和白色(〜74.2 cd / A,每个电子〜28.5%的光子)迄今为止,磷光OLED表现出最高的溶液处理OLED记录的电致发光效率。我们还演示了一种经过解决方案处理的柔性固态照明设备,它将作为我们设备的潜在应用。

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