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

化学掺杂低驱动电压有机EL器件的开发

基本信息

批准号：
15205023
负责人：
KIDO Junji
金额：
$ 31.12万
依托单位：
Yamagata university
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

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

为了降低有机电致发光器件的驱动电压，合成了新型的电子和空穴传输材料，并将其应用于有机电致发光器件中，对其电致发光性能进行了研究。在电子传输材料方面，合成了菲咯啉、喹啉和苯基吡啶衍生物，并将其应用于有机电致发光器件中作为电子传输层。所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。使用新型电子传输材料的器件显示出比Alq更低的驱动电压，Alq已被用于良好的电子传输材料。从这些结果，菲咯啉，喹啉和苯基吡啶衍生物是有用的，作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。特别是，Yb显示出与Alq合适的真空沉积和电子注入能力， ...更多信息 CH为化学掺杂基质。这一结果表明，它们可用于Cs、Li等碱金属以外的材料的化学掺杂，并扩大电子注入层的选择范围，以降低驱动电压。在空穴传输材料方面，合成了含芴单元的芳胺低聚物，并将其应用于有机电致发光器件。这些低聚物具有很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EL器件的有用材料。与真空蒸镀器件相比，旋涂器件的驱动电压较低。这些结果被理解的空穴迁移率的测量由TOF和表面形貌观察由SPM。此外，这些芳胺低聚物在溶液中与刘易斯酸和电子受体形成电荷转移络合物。结果表明，该溶液制备的薄膜具有较好的空穴注入能力，化学掺杂层具有较低的驱动电压。少