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Fabrication and characterization of high-quality and stable thin film using organic alloy method, and application of the film to organic devices

有机合金法制备高质量稳定薄膜、表征及其在有机器件中的应用

基本信息

批准号：
18360146
负责人：
MORI Tatsuo
金额：
$ 10.05万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

We fabricated organic alloy films by a co-evaporation method. In this study, we discussed hole-transport materials and hole-blocking materials which are used in organic light-emitting diodes. In the case of hole-transport material, we fabricated organic alloy films consisting of a triphenyl diamine derivative (TPD) and naphthyl-substituted diamine derivative (NPD). We clarified that the polycrystallization in organic alloy films is remarkably suppressed as compared with both single films. In the case of hole-blocking material, we fabricated bathocuproin (BCP) -based alloy films combined with NPD of hole-transport material, oxadiazole derivative(PBD)of electron-transport material, non-substituted BCP (Bphen) of hole-blocking material and lithium quinoline(Liq)of electron-injection material. BCP thin films have a unstable film morphology and immediately crystallize after a few hours from evaporation. However, we obtained stable and high-quality BCP-based alloy films by the organic alloy method. But it was not successful to fabricate organic alloy film consisting of BCP and because the size matching between BCP and Liq is poor. As the next step, we fabricated OLEDs with aluminum quinoline (A1q3) as an emitting material by the introduction of organic alloy films. These OLEDs with an organic alloy film showed the similar device performance as the conventional OLED without an organic alloy film. That is, organic alloy method was found little to affect carrier transport of OLEDs. In the case of hole-blocking layer, however, although the organic alloy films combined with closely-related Bphen and PBD showed a stable film structure and an excellent electronic property, the organic alloy films combined with NPD of hole-transport material showed a stable film structure but a low hole-blocking property. Therefore, NPD could not be used as the counter molecule against BCP.

我们采用共蒸发的方法制备了有机合金薄膜。本论文主要讨论了有机电致发光器件中的空穴传输材料和空穴阻挡材料。在空穴传输材料的情况下，我们制作的有机合金薄膜由三苯基二胺衍生物（TPD）和萘基取代的二胺衍生物（NPD）。我们澄清，在有机合金膜的多晶化显着抑制相比，这两个单一的薄膜。在空穴阻挡材料方面，我们分别以NPD为空穴传输材料、恶二唑衍生物（PBD）为电子传输材料、非取代BCP（Bphen）为空穴阻挡材料、喹啉锂（Liq）为电子注入材料，制备了浴铜灵（BCP）基合金薄膜。BCP薄膜具有不稳定的膜形态，并且在蒸发几小时后立即结晶。然而，我们通过有机合金法获得了稳定和高质量的BCP基合金膜。但由于嵌段共聚物与Liq的尺寸匹配性差，制备嵌段共聚物有机合金薄膜并不成功。作为下一步，我们制作了有机发光二极管与铝喹啉（A1q3）作为发光材料，通过引入有机合金薄膜。这些具有有机合金膜的OLED显示出与没有有机合金膜的传统OLED相似的器件性能。也就是说，发现有机合金方法对OLED的载流子输运几乎没有影响。在空穴阻挡层的情况下，虽然与密切相关的Bphen和PBD组合的有机合金膜显示出稳定的膜结构和优异的电子性能，但与空穴传输材料NPD组合的有机合金膜显示出稳定的膜结构，但空穴阻挡性能较低。因此，NPD不能作为BCP的反分子。