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Fluorinated anthracene derivatives as deep-blue emitters and host materials for highly efficient organic light-emitting devices

机译:氟化蒽衍生物作为深蓝色发射体和高效有机发光器件的主体材料

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摘要

Novel fluorinated anthracene based deep-blue-emitting molecules, namely 9,10-bis-(n'-fluoro-biphenyl3-yl)-anthracene (nF-DPAs), have been designed and synthesized by a Suzuki cross-coupling reaction. The influence of substitution position of fluorinated electron-withdrawing group on the energy levels and photophysical properties of nF-DPAs was studied by experiment and density functional theory (DFT). Organic light-emitting devices (OLEDs) using nF-DPAs as non-doped emitter exhibit bright deep blue electroluminescence with Commisssion Internationale de L'Eclairage (CIE) coordinates of (0.15, 0.09) for 2F-DPA, (0.15, 0.09) for 3F-DPA, and (0.15, 0.07) for 4F-DPA. Furthermore, it was demonstrated that these nF-DPAs serve as excellent host materials for 4,4'-Bis[4-(di-p-tolylamino) styryl]biphenyl (DPAVBi). Especially, OLEDs using 2F-DPA as the fluorescent host exhibit pure blue emission with CIE coordinates of (0.15, 0.30), high luminance over 20 000 cd m(-2), high current efficiency of 9.6 cd A(-1), and high external quantum efficiency of 5.2%. Our new fluorinated derivatives show potential applications for highly efficient blue OLEDs.
机译:通过铃木交叉偶联反应设计并合成了新型的基于氟化蒽的深蓝色发光分子,即9,10-双-(n'-氟代联苯3-基)-蒽(nF-DPA)。通过实验和密度泛函理论(DFT)研究了氟化吸电子基团的取代位置对nF-DPA的能级和光物理性质的影响。使用nF-DPA作为非掺杂发射极的有机发光器件(OLED)表现出明亮的深蓝色电致发光,国际照明委员会(CIE)坐标对于2F-DPA为(0.15,0.09),对于(2)为(0.15,0.09) 3F-DPA,对于4F-DPA为(0.15,0.07)。此外,已证明这些nF-DPA可作为4,4'-双[4-(二-对甲苯基氨基)苯乙烯基]联苯(DPAVBi)的优良主体材料。特别是,使用2F-DPA作为荧光主体的OLED表现出纯蓝色发射,其CIE坐标为(0.15,0.30),在20000 cd m(-2)上具有高亮度,在9.6 cd A(-1)下具有高电流效率,并且5.2%的高外部量子效率。我们的新型氟化衍生物显示了高效蓝色OLED的潜在应用。

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