一种深蓝色的B,N-杂的素发射剂,显示热激活的延迟光和通过三倍三倍消灭的延迟光
Subeesh Madayanad Suresh1, Eimantas Duda2, David Hall1,3
1Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, U.K. KY16 9ST.
Journal of the American Chemical Society
|March 6, 2020
概括
一种和添加的新型肝素表现出热激活的延迟光 (TADF) 以有效的深蓝色发射. 这一发现为先进的有机电子材料开辟了新的途径.
科学领域:
- 有机化学
- 材料科学
- 光物理学
背景情况:
- 开发高效的有机发光材料对于先进的显示器和照明至关重要.
- 热激活延迟光 (TADF) 通过收集三重激子提供了高效发射器的途径.
- 为TADF设计新的分子架构是一个持续的挑战.
研究的目的:
- 设计和合成一种新的,热稳定的,近紫外线发射的B,N-doped heptacene.
- 研究其光物理特性,特别是其热激活延迟光 (TADF) 机制.
- 探索TADF在较大的acenes中的潜力,并了解结构属性关系.
主要方法:
- 一个B,N-杂的heptacene衍生物的化学合成.
- 光发光光谱分析辐射特性和TADF.
- 基于相关的波函数计算以预测电子属性 (ΔEST).
- 扫描道显微镜 (STM) 用于研究表面组装.
主要成果:
- 一种具有高热稳定性和良好的B,N-合肝素的成功合成.
- 在室温下观察多共振 (MR) TADF,这是非三角系统中罕见的现象.
- 狭窄,深蓝色的发射与CIE坐标 (0.17,0.01).
- 已经证明了温度依赖的排放机制 (三倍三倍灭绝与TADF).
- 通过理论计算预测了构成性异构体的不同光电子行为.
- 在Au{111}表面上观察到自我组装成有序的层.
结论:
- 设计的B,N-化酸是一种有前途的非三角基MR-TADF发射器,用于深蓝光.
- 分子设计策略可以有效地调整 TADF 特性.
- 该化合物表现出基于温度和聚合状态的可控排放机制.
- 这项研究提供了对TADF材料结构性质关系的全面了解.
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