Developments of Low-driving voltage Organic EL devices by Chemically Doping

为了降低有机电致发光器件的驱动电压，合成了新型电子和空穴传输材料，并将其应用于有机电致发光器件中，对其电致发光特性进行了表征。在电子传输材料方面，合成了邻菲咯啉、喹啉和苯基吡啶类化合物，并将其作为电子传输层应用于有机电致发光器件。合成的材料具有较高的玻璃化转变温度和良好的薄膜均匀性。采用新型电子传输材料的器件显示出比AlQ器件更低的驱动电压，这已被用于良好的电子传输材料。从这些结果来看，邻菲咯啉、喹啉和苯基吡啶衍生物有望成为良好的电子传输材料。然后，研究了稀土金属作为电子注入层的新型化学掺杂材料。具体地说，Yb表现出了良好的真空沉积性能和电子注入能力，适用于…更多的CH是化学掺杂的基质。这一结果表明，它们将被用于碱金属以外的化学掺杂材料，如Cs和Li，并扩大了电子注入层的选择，以降低驱动电压。在空穴传输材料方面，合成了具有荧烯单元的新型芳胺类引发剂，并将其应用于有机电致发光器件。这些新型低聚物具有较高的玻璃化转变温度，可以通过旋涂和真空蒸发的方法形成良好的薄膜。因此，这些低聚物有望成为大规模生产和制造有机电致发光器件的有用材料。与真空蒸发法相比，旋涂法制备的器件具有更低的驱动电压。这些结果可以通过TOF测量空穴迁移率和SPM观察表面形貌来理解。此外，这些芳胺低聚物在溶液中与Lewis酸和电子受体形成电荷转移络合物。从溶液中制备的薄膜具有良好的空穴注入能力，并且化学掺杂层获得了较低的驱动电压。较少

For lowering driving-voltage of organic EL devices, new electron and hole-transporting materials were synthesized and applied to organic EL devices to characterize their EL properties. As for electron-transporting materials, phenanthroline, quinoline and phenyl pyridine derivatives were synthesized and applied to organic EL devices as an electron-transporting layer. The synthesized materials have high glass transition temperatures and showed good uniformity of thin films. The devices used new electron-transporting materials showed lower driving voltage than that of Alq, which have been used for good electron-transporting materials. From these results, Phenanthroline, quinoline and phenylprydine derivatives are expected to be useful as good electron-tranporting materials. Then rare-earth metals were investigated for new chemically doping materials for an electron injection layer. Specifically, Yb showed suitable properties of vacuum deposition and electron-injection ability for Alq, whi … More ch was chemically doping matrix. This result suggests that they will be used for chemically doping materials other than alkaline metals, such as Cs and Li, and expanding a choice of electron injeciton layers for lowering driving-voltage.As for hole-transporting materials, new arylamine origomers having fluorene units were synthesized and applied to organic EL devices. These new oligomers have high glass transition temperatures, and can be formed good thin films by spin-coating and vacuum-evaporation methods. Therefore these oligomers are expected to be useful materials for mass-production and manufacturing of organic EL devices. The devices fabricated by spin-coating were showed lower driving voltage, compared with vacuum-evaporated ones. These results were understood by measurements of hole mobilities by TOF and surface morphology observation by SPM. In addition, these aryamine oligomers formed charge-transfer complex with Lewis acid and an electron-acceptor in solution. Then the films from the solutions showed good hole-injection abilities, and the chemically doping layers achieved lower driving-voltage. Less