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Universal Bipolar Host Materials for Blue, Green, and Red Phosphorescent OLEDs with Excellent Efficiencies and Small-Efficiency Roll-Off
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-07-04 00:00:00 , DOI: 10.1021/acsami.9b06995 Shimin Hu 1 , Jiajie Zeng 1 , Xiangyu Zhu 1 , Jingjing Guo 1 , Shuming Chen 2 , Zujin Zhao 1 , Ben Zhong Tang 1, 3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-07-04 00:00:00 , DOI: 10.1021/acsami.9b06995 Shimin Hu 1 , Jiajie Zeng 1 , Xiangyu Zhu 1 , Jingjing Guo 1 , Shuming Chen 2 , Zujin Zhao 1 , Ben Zhong Tang 1, 3
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Host materials are indispensable for the fabrication of organic light-emitting diodes (OLEDs) with phosphorescent emitters, but high-quality host materials that can efficiently and simultaneously function in blue, green, and red phosphorescent OLEDs (PHOLEDs) are much rare. In this work, four bipolar materials are developed using carbazole and 9,9-dimethyl-9,10-dihydroacridine as hole-transporting groups, pyridine as electron-transporting groups, and biphenyl and m-methylbiphenyl as π-spacers. The crystal and electronic structures indicate that these materials have highly twisted conformations, which endow them with aggregation-induced emission features, intramolecular charge transfer processes, wide energy band gaps, and high triplet energies. The carrier transport ability and energy transfer property analyses show that these materials are able to achieve balanced hole and electron transports and can serve as bipolar host materials for PHOLEDs. A series of monochromatic PHOLEDs with different phosphorescent dopants, including blue-emissive FIrpic, green-emissive Ir(ppy)2(acac), and red-emissive Ir(piq)2(acac), are fabricated by employing these four host materials. The green PHOLEDs can provide an impressive luminance of up to 230 200 cd m–2. Based on an identical host material, excellent external quantum efficiencies as high as 25.12, 24.73, and 19.71%, as well as minor efficiency roll-off, are attained for blue, green, and red PHOLEDs, respectively, clearly demonstrating the promising applications as universal bipolar host materials in PHOLEDs with monochromatic light and white light.
中文翻译：
适用于蓝色，绿色和红色磷光OLED的通用双极主体材料，具有出色的效率和小效率滚降
主体材料对于具有磷光发射器的有机发光二极管（OLED）的制造是必不可少的，但是能够有效地同时在蓝色，绿色和红色磷光OLED（PHOLED）中起作用的高质量主体材料却很少见。在这项工作中，四种双极材料通常是使用咔唑和9,9-二甲基-9,10-二氢吖啶作为空穴传输性基团，如吡啶电子传输基和联苯基和开发米-甲基联苯作为π-间隔基。晶体和电子结构表明这些材料具有高度扭曲的构象，使其具有聚集诱导的发射特征，分子内电荷转移过程，宽能带隙和高三重态能量。载流子传输能力和能量转移性能分析表明，这些材料能够实现平衡的空穴和电子传输，并且可以用作PHOLED的双极性主体材料。通过使用这四种主体材料，可以制造出具有不同磷光掺杂剂的一系列单色PHOLED，包括蓝色发光的FIrpic，绿色发光的Ir（ppy）2（acac）和红色发光的Ir（piq）2（acac）。绿色PHOLED可以提供高达230200 cd m的令人印象深刻的亮度–2。基于相同的基质材料，蓝色，绿色和红色PHOLED分别获得了高达25.12、24.73和19.71％的出色外部量子效率，以及次要的效率下降，显然证明了有前途的应用前景PHOLED中具有单色光和白光的通用双极主体材料。
更新日期：2019-07-04
中文翻译：
适用于蓝色，绿色和红色磷光OLED的通用双极主体材料，具有出色的效率和小效率滚降
主体材料对于具有磷光发射器的有机发光二极管（OLED）的制造是必不可少的，但是能够有效地同时在蓝色，绿色和红色磷光OLED（PHOLED）中起作用的高质量主体材料却很少见。在这项工作中，四种双极材料通常是使用咔唑和9,9-二甲基-9,10-二氢吖啶作为空穴传输性基团，如吡啶电子传输基和联苯基和开发米-甲基联苯作为π-间隔基。晶体和电子结构表明这些材料具有高度扭曲的构象，使其具有聚集诱导的发射特征，分子内电荷转移过程，宽能带隙和高三重态能量。载流子传输能力和能量转移性能分析表明，这些材料能够实现平衡的空穴和电子传输，并且可以用作PHOLED的双极性主体材料。通过使用这四种主体材料，可以制造出具有不同磷光掺杂剂的一系列单色PHOLED，包括蓝色发光的FIrpic，绿色发光的Ir（ppy）2（acac）和红色发光的Ir（piq）2（acac）。绿色PHOLED可以提供高达230200 cd m的令人印象深刻的亮度–2。基于相同的基质材料，蓝色，绿色和红色PHOLED分别获得了高达25.12、24.73和19.71％的出色外部量子效率，以及次要的效率下降，显然证明了有前途的应用前景PHOLED中具有单色光和白光的通用双极主体材料。
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