高三重能量聚合物作为高效电光的宿主,具有高效率
Yen-Chun Chen1, Guo-Sheng Huang, Chung-Chin Hsiao
1Chemical Engineering Department, National Tsing-Hua University, Hsinchu 30041, Taiwan, R.O.C.
Journal of the American Chemical Society
|June 29, 2006
概括
一种新型的合聚合物,P(tBu-CBP),在光器件中显示出高效率. 侧组修改是优化能量水平和电荷平衡的关键,超越三重能量差异.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 光物理学的光学物理学
背景情况:
- 光有机发光二极管 (PhOLED) 对于高效的照明和显示器至关重要.
- 主体材料显著影响PhOLED的性能,特别是它们的三倍能量 (E(T)) 和电荷传输特性.
- 优化主机-客户互动对于高设备效率至关重要.
研究的目的:
- 为了研究一种新型结合聚合物的性能,P(tBu-CBP),作为PhOLED中的宿主材料.
- 评估侧组修改对宿主材料特性和设备效率的影响.
- 了解主机E,T,能量水平和电荷平衡之间的相互作用,以确定PhOLED性能.
主要方法:
- 结合聚合物P ((tBu-CBP) 的合成和表征.
- 使用P(tBu-CBP) 作为主体材料制造绿色和红色发射的PhOLED.
- 设备性能测试,包括光效率,外部量子效率和开启电压.
- 与使用类似的骨干聚合物P(3,6-Cz) 作为主体的设备进行比较.
主要成果:
- P(tBu-CBP) 呈现出高的三重能量 (2.53 eV) 和合适的HOMO (5.3 eV) 和LUMO (2.04 eV) 水平.
- 用绿色和红色Ir复合物合的设备实现了高光效率 (分别为23.7cd/A和5.1cd/A) 和外部量子效率 (分别为6.57%和4.23%).
- 使用P{tBu-CBP) 主机的设备的效率大约是使用P{3,6-Cz) 的四倍,尽管E{T}略低.
结论:
- 在P ((tBu-CBP) 中,碳醇的9位侧组修改对于调整HOMO/LUMO水平至关重要.
- 平衡的电子和孔流,以及排挤剂预防,大大有助于设备的高效率.
- 单独的三重能量差异并不是PhOLED效率的唯一决定因素;主体材料的设计是至关重要的.
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