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高效和长寿命有机光后材料的双机制设计策略

Guangming Wang¹, Xuefeng Chen¹, Ying Zeng¹

¹State Key Laboratory of Organometallic Chemistry and Shanghai Hongkong Joint Laboratory in Chemical Synthesis, Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People's Republic of China.

Journal of the American Chemical Society

|August 30, 2024

概括

这项研究引入了有机后照材料的双机制策略,将高效率 (TADF/RTP) 与长时间 (OLPL) 结合起来. 这种方法克服了权衡,为先进的应用提供了高效和长时间的光发射.

科学领域:

材料科学
有机电子
光物理学

背景情况:

有机室温光 (RTP) 和后发光材料具有显著的应用潜力.
现有的材料面临着后照效率和排放寿命之间的权衡.
开发具有高效率和长寿命的材料是一个关键挑战.

研究的目的:

为有机后发光材料设计双机制策略.
使用RTP或热激活延迟光 (TADF) 实现高后照效率.
通过使用有机长时间持续发光 (OLPL) 来实现长时间的光照.

主要方法:

将分子内电荷转移 (ICT) 类型的二二甲酸分子入有机基质中.
引入电子捐赠者作为第三个组件来创建陷并促进电荷分离.
研究重原子对系统间交叉和电荷分离的影响.
采用稀土升级材料用于近红外激发.

主要成果:

实现了TADF类型的后发光材料,效率高达88.7%,寿命长达200毫秒.
开发的双机制材料初始显示TADF/RTP后照 (高达50.9%的效率),随后持续数小时的OLPL后照 (高达13.1%的效率).
证明重原子效应增强了系统间交叉并提高了OLPL的性能.
通过稀土上升转换使OLPL材料具有近红外激发特性.

结论:

拟议的双机制设计策略有效地平衡后照效率和持续时间.
开发的材料在需要高初始亮度和长时间发射的应用中表现出有前途的性能.
这些发现为未来的技术进步,包括生物成像,提供了优化有机光后材料的见解.

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