深红色双核复合体中的热激活的延迟光:一个用于短发光寿命的隐藏机制
Piotr Pander1,2,3, Andrey V Zaytsev4, Amit Sil5
1Faculty of Chemistry, Silesian University of Technology M. Strzody 9 44-100 Gliwice Poland piotr.pander@polsl.pl.
Chemical science
|December 11, 2023
概括
这项研究揭示了一种新的机制,热激活延迟光 (TADF),在复合物中,提高了它们的发光效率. 这一发现为设计先进的复合体为OLED等应用开辟了新的途径.
科学领域:
- 有机金属化学 有机金属化学
- 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:
- 循环金属化 (Cyclometallated iridium) 复合物对于OLED由于其高发光效率至关重要.
- 它们的效率传统上归因于旋转轨道合促进光.
- 热激活延迟光 (TADF) 在有机发射器中已知,但在复合体中没有观察到.
研究的目的:
- 为了研究复合体中除光之外的额外发光机制.
- 在一个新的双核 (iii) 复合体中识别和描述TADF.
- 探索TADF对设计高效的基于的发射器的影响.
主要方法:
- 一个新的双核复合物的合成和结构特征 (X射线衍射).
- 可变温度辐射光谱学用于研究发光路径.
- 光发光寿命测量. 光发光寿命测量.
- 计算计算 (旋转轨道合) 来建模温度依赖的行为.
主要成果:
- 确立了在复合体中存在TADF通路的明确证据.
- 双核复合体表现出深红色的发光 (λem = 643 nm).
- 发现TADF可以减少光发光的寿命,并且与小的S1-T1能量差距 (≈50 meV) 相关.
- 一个经过溶液处理的OLED显示出5.5%EQE的红色电解发光 (λEL = 625nm).
结论:
- 一个TADF通路可以在 ((iii) 复合体中运行,补充光.
- 这一发现为设计高效的基于的发射器提供了新的策略.
- 在复合体中观察到的TADF机制可能会对未来的OLED技术产生重大影响.
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