New spiro[benzotetraphene-fluorene] Derivatives: Synthesis and Application in Sky-Blue Fluorescent Host Materials
作者:Jae-Ryung Cha、Chil-Won Lee、Myoung-Seon Gong
DOI:10.1007/s10895-014-1403-2
日期:2014.7
Blue light-emitting spiro[benzotetraphene-fluorene] (SBTF)-based host materials, 3-(1-naphthyl)-10-naphthylspiro[benzo[ij]tetraphene-7,9′-fluorene] (1), 3-(2-naphthyl)-10-naphthylspiro[benzo[ij]tetraphene-7,9′-fluorene] (2), and 3-[2-(6-phenyl)naphthyl]-10-naphthylspiro[benzo[ij]tetraphene-7,9′-fluorene] (3) were designed and prepared via multi-step Suzuki coupling reactions. Introducing various aromatic groups into SBTF core lead to a reduction in band gap and a determination of the color purity and luminescence efficiency. Typical sky-blue fluorescent organic light emitting diodes with the configuration of ITO/N,N′-di(1-naphthyl)-N,N′-bis[(4-diphenylamino)phenyl]-biphenyl-4,4′-diamie (60 nm)/N,N,N′,N′-tetra(1-biphenyl)-biphenyl-4,4′-diamine (30 nm)/host: dopant (30 nm, 5 %)/LG201 (electron transporting layer, 20 nm)/LiF/Al were developed using SBTF derivatives as a host material and p-bis(p-N,N-diphenyl-aminostyryl)benzene (DSA-Ph) as a sky-blue dopant material. A device obtained from three materials doped with DSA-Ph showed color purity of 0.148 and 0.239, a luminance efficiency of 7.91 cd/A, and an external quantum efficiency >4.75 % at 5 V.
基于 3-(1-萘基)-10-萘基螺[苯并[ij]四吩-7,9′-芴](1)、3-(2-萘基)-10-萘基螺[苯并[ij]四吩-7、9′-芴](2)和 3-[2-(6-苯基)萘基]-10-萘基螺[苯并[ij]四烯-7,9′-芴](3)。在 SBTF 内核中引入各种芳香基团会导致带隙减小,并影响颜色纯度和发光效率。典型的天蓝色荧光有机发光二极管的构型为 ITO/N,N′-二(1-萘基)-N,N′-双[(4-二苯基氨基)苯基]-联苯-4,4′-二胺(60 ;nm)/N,N,N′,N′-四(1-联苯)-联苯-4,4′-二胺(30 nm)/host:以 SBTF 衍生物为宿主材料,对-双(对-N,N-二苯基氨基苯乙烯基)苯(DSA-Ph)为天蓝色掺杂剂材料,开发了掺杂剂(30 nm,5 %)/LG201(电子传输层,20 nm)/LiF/Al 器件。由掺杂了 DSA-Ph 的三种材料制成的器件的色纯度分别为 0.148 和 0.239,亮度效率为 7.91 cd/A,在 5 V 电压下的外部量子效率为 4.75 %。