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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Correlating the transition dipole moment orientation of phosphorescent emitter molecules in OLEDs with basic material properties
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Correlating the transition dipole moment orientation of phosphorescent emitter molecules in OLEDs with basic material properties

机译:将OLED中磷光发射体分子的跃迁偶极矩方向与基本材料特性相关联

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摘要

The orientation of the emissive dipole moment of seven iridium-based phosphorescent emitter molecules commonly used in organic light-emitting diodes (OLEDs) is investigated. The orientation of Ir(ppy)(3), Ir(ppy)(2)(acac), Ir(chpy)(3), Ir(dhfpy)(2)(acac), Ir(BT)(2)(acac), Ir(MDQ)(2)(acac), and Ir(piq)(3) is determined by measuring the angle dependent spectral radiant intensity of the transverse magnetic polarized emission from p-i-n OLEDs comprising these emitters. The experimental data are compared to the intensity calculated by a multilayer simulation method that includes the anisotropy factor describing the average dipole orientation. Surprisingly, among these molecules, Ir(ppy)(3) is the only emitter showing an isotropically distributed transition dipole moment. In order to correlate our results with basic molecular properties, the permanent dipole moment and the size of the molecules are calculated by density functional theory (DFT). The dipole-dipole potential obtained for Ir(ppy)(3) is more than 2.5 times larger than those for all other emitter molecules investigated here, indicating that this parameter is correlated with the transition dipole moment orientation.
机译:研究了通常用于有机发光二极管(OLED)中的七个铱基磷光发射体分子的发射偶极矩的取向。 Ir(ppy)(3),Ir(ppy)(2)(acac),Ir(chpy)(3),Ir(dhfpy)(2)(acac),Ir(BT)(2)(acac)的方向),Ir(MDQ)(2)(acac)和Ir(piq)(3)通过测量来自包含这些发射器的PIN OLED的横向磁极化发射的角度相关光谱辐射强度来确定。将实验数据与通过多层模拟方法计算的强度进行比较,该方法包括描述平均偶极子取向的各向异性因子。出乎意料的是,在这些分子中,Ir(ppy)(3)是唯一显示各向同性分布跃迁偶极矩的发射极。为了使我们的结果与基本分子特性相关联,通过密度泛函理论(DFT)计算了永久偶极矩和分子大小。 Ir(ppy)(3)所获得的偶极-偶极电位比此处研究的所有其他发射极分子的偶极-偶极电位大2.5倍以上,表明该参数与跃迁偶极矩方向相关。

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