基于carborane的光电子活性有机分子:用于蓝色光的宽带间隙宿主材料
Kyung-Ryang Wee1, Yang-Jin Cho, Soyeong Jeong
1Department of Advanced Materials Chemistry, Korea University, 2511 Sejong-ro, Sejong 339-700, South Korea.
Journal of the American Chemical Society
|October 13, 2012
概括
基于碳的新材料使得高效的深蓝色光有机发光二极管 (PHOLED) 成为可能. 这些碳酸宿主提供高三倍能量和稳定性,对于高级蓝色PHOLED应用至关重要.
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:
- 深蓝色光有机发光二极管 (PHOLED) 对于全彩显示和照明至关重要.
- 为蓝色PHOLED开发稳定高效的宿主材料仍然是一个重大挑战.
研究的目的:
- 为深蓝色PHOLEDs合成和表征新的基于碳化合物的宿主材料.
- 研究碳酸异构体之间的结构-性质关系及其在PHOLED中的表现.
主要方法:
- 用卡巴佐基烯基单元 (o-Cb,m-Cb,p-Cb) 合成正基,甲基和副碳酸衍生物.
- 光物理特征包括三倍能量 (T) 和玻璃过渡温度 (T) 的测量.
- 使用p-Cb作为主体材料的PHOLED设备制造和测试.
- 密度函数理论 (DFT) 计算以了解电子属性.
主要成果:
- 基于碳素的宿主 (m-Cb,p-Cb) 呈现出高的三重能量 (3.1 eV) 和不结合的结构,适合蓝色PHOLED.
- 高的玻璃过渡温度 (m-Cb的132°C,p-Cb的164°C) 表明其具有良好的热稳定性.
- p-Cb表现出高孔移动性 (1.1 × 10((-3) cm((2) / V s)) 并成功地用于深蓝色的PHOLED.
- 制造的基于p-Cb的PHOLED实现了高外部量子效率15.3%,CIE坐标为 (0.15,0.24).
结论:
- 碳结构提供了有利的光物理特性,包括高三倍能量,对于深蓝色PHOLED来说至关重要.
- 由于m-Cb和p-Cb的非结合性和高热稳定性,使它们成为有希望的宿主材料.
- 作为高效和稳定的深蓝色PHOLED的宿主材料,p-Cb表现出卓越的性能.
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