A novel diphenylamine/spiro[fluorene-9,9′-xanthene] (SFX) hybrid (SFX27DPA) was constructed successfully by incorporating diphenylamine into SFX via Pd-catalyzed CN cross-coupling to ingeniously develop state-of-the-art models of solution-processible small molecule host for uncovering the structure-property relationship of molecular structure change in the application of PhOLEDs, which is vital to rational cumulative enhancement in device performance by purposive and feasible structure modifications. SFX27DPA shows outstanding thermal stability (T_d, 425 °C) compared to those of SFXDPA ((Spiro[fluorene-9,9′-xanthen]-2-yl)-diphenylamine) (T_d, 338 °C) and SFX-Cz ((2-carbazolyl-spiro[fluorene-9,9′-xanthene]) (T_d, 345 °C) by increasing the molecular weight but owns weak morphological stability due to its low melting point (T_c, 60.5 °C). The HOMO (−5.28 eV), LUMO (−2.08 eV), and energy gap (E_g, 3.20 eV) were obtained by cyclic voltammetry measurements (CVs). The high T₁ (T₁, 2.98 eV) and narrow energy gap (E_g, 3.20 eV) are beneficial to achieving high efficient device. The compound not only possesses a high triplet energy level but also exhibits good solubility in common solvents. Two SFX-based compounds (SFX27DPA, SFX-Cz) for red PhOLEDs have been fabricated successfully by solution process for deep researching the relationship between molecular structure and device performance. An enhanced performance of device based on SFX27DPA with maximum external quantum efficiencies (EQEs) of 10.9% under lower driving voltage was obtained compared to that of SFX-Cz-based red PhOLEDs (1.5%). This investigation offers good reference for future molecular design to achieve high performance through accumulative structure modification.

通过经由Pd催化的C N交叉偶联将二苯胺结合到SFX中，从而巧妙地开发了最新的模型，从而成功构建了新型的二苯胺/螺[芴-9,9'-氧杂蒽]（SFX）杂化物（SFX27DPA）。溶液可加工的小分子宿主的研究，以揭示在PhOLEDs应用中分子结构变化的结构-性质关系，这对于通过有目的和可行的结构修改来合理地累积提高器件性能至关重要。SFX27DPA表现出优异的热稳定性（T _d相比，这些SFXDPA（（螺[芴-9,9'-呫吨] -2-基） -二苯胺）（T的，425℃）_d，338°C）和SFX-Cz（（2-carbazolyl-spiro [fluorene-9,9'-xanthene]）（T _d，345°C）通过增加分子量，但由于其低熔点而具有较弱的形态稳定性点（T _ç，60.5℃）。该HOMO（-5.28电子伏特），LUMO（-2.08电子伏特），和能隙（E_克，3.20伏特）通过循环伏安法测量（CVS）获得的。高t ₁（ Ť ₁，2.98电子伏特）和窄能隙（E_克，3.20电子伏特）是实现高效的设备是有益的。所述的化合物不仅具有高的三重态能级，但也表现出在普通溶剂中良好的溶解性。基于SFX-两种化合物（SFX27DPA，SFX-Cz）对于红色PhOLED，已通过溶液法成功制备出来，用于深入研究分子结构与器件性能之间的关系。与基于SFX-Cz的红色PhOLED（1.5％）相比，基于SFX27DPA的器件在较低的驱动电压下具有最大的外部量子效率（EQE）为10.9％的增强性能。该研究为将来的分子设计通过累积结构修饰实现高性能提供了很好的参考。