光与热激活的延迟光相比. 控制单点三点分裂成发光和可化Cu (I) 化合物
Markus J Leitl1, Valentina A Krylova, Peter I Djurovich
1Institute for Physical Chemistry, University of Regensburg , 93040 Regensburg, Germany.
Journal of the American Chemical Society
|September 27, 2014
概括
两个含有N-异环碳联体的铜 (I) 复合物显示出高排放. 一个复杂的展览热激活延迟蓝色光 (TADF) 和光,为有机发光二极管提供了一种新的机制.
科学领域:
- 协调化学 协调化学
- 光物理学的光学物理学
- 材料科学 材料科学 材料科学
背景情况:
- 三坐标铜(I) 复合体对排放性应用具有前景.
- 调整连接体结构影响光物理性质,如光和光.
- 了解兴奋状态动态对于开发高效的有机发光二极管 (OLED) 至关重要.
研究的目的:
- 研究两种新型三坐标Cu (I) 复合体与不同的N-异环碳素 (NHC) 配体的光物理性质.
- 在结构相似的复合体中阐明控制不同排放行为 (TADF与光) 的因素.
- 探索这些复合体在OLED应用中的潜力.
主要方法:
- 合成和描述两个Cu (I) 复合物: (IPr) Cu (py2-BMe2) 和 (Bzl-3,5Me) Cu (py2-BMe2).
- 详细的光物理研究,包括辐射量子产量测量,时间分辨率光谱和激发状态动态分析.
- 计算分析以将结构参数 (扭转角度) 与光物理性质相关联.
主要成果:
- 这两种复合体都表现出高粉末排放量子产量 (>70%).
- 化合物1显示热激活延迟蓝色光 (TADF),而化合物2显示纯黄色光,归因于连接体扭转角度的差异.
- 在两个复合体中都观察到有效的旋转轨道合 (SOC),导致短的三重状态发射衰变时间 (34μs为1,21μs为2).
- 化合物1在环境温度下呈现双重辐射衰变路径:62%的TADF和38%的光.
结论:
- 连接体的设计,特别是连接体之间的扭矩角度,对Cu (I) 复合体的光物理性质和发射路径产生重大影响.
- 化合物1中的双辐射衰变机制提供了一种新的方法来增强激子收集并减少OLED中的排放衰变时间.
- 这些发现为开发基于铜复合物的先进排放材料为光电子设备铺平了道路.
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