Morphological Stable Spirobifluorene/Oxadiazole Hybrids as Bipolar Host Materials for Efficient Green and Red Electrophosphorescence
作者:Youtian Tao、Liang Ao、Qiang Wang、Cheng Zhong、Chuluo Yang、Jingui Qin、Dongge Ma
DOI:10.1002/asia.200900433
日期:2010.2.1
A series of 9,9′‐spirobifluorene/oxadiazole hybrids with various linkages between two components, namely SBF‐p‐OXD (1), SBF‐m‐OXD (2), and SBF‐o‐OXD (3) are designed and synthesized through Suzuki cross‐coupling reactions. The incorporation of a rigid and bulky spirobifluorene moiety greatly improves their thermal and morphological stability, with Td (decomposition temperature) and Tg (glass transition
设计了一系列9,9'-螺二芴/恶二唑杂化体,它们在SBF- p- OXD(1),SBF- m- OXD(2)和SBF- o- OXD(3)两个组件之间具有各种联系。通过铃木交叉偶联反应合成。刚性和庞大的螺二芴部分的结合极大地改善了它们的热和形态稳定性,T d(分解温度)和T g(玻璃化转变温度)分别在401–480°C和136–210°C的范围内。2和3,带有meta-和ortho由于两个组分之间的π共轭减少,因此-链显示出比其对联类似物1更高的三重态能量以及蓝移吸收和发射。它们的HOMO和LUMO能级分别取决于在5.57–5.64 eV和2.33–2.49 eV范围内的链接模式。多层深红色磷光器件1,2,3作为宿主被制造和它们的EL效率遵循的顺序3(Ô)> 2(米)> 1(p),这与其三重态能量以及分子轨道上HOMO和LUMO分布的分离有关。通过分别使用2和3作为主体材料,绿色和深红色磷