对称性破坏辅助快速反向系统间交叉,以实现高效的TADF材料
Hao Liu1,2, Yan Fu1, Jingsong Zhang1
1State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China.
Angewandte Chemie (International ed. in English)
|September 10, 2025
概括
新的不对称分子加速了有机发光二极管 (OLED) 的热激活延迟光 (TADF) 材料中的反向系统间交叉 (RISC) 过程. 这一突破提高了电解发光效率和运行稳定性,为先进的OLED技术铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 摄影化学的使用.
背景情况:
- 反向交叉系统 (RISC) 过程对于有机发光二极管 (OLED) 中的热激活延迟光 (TADF) 材料至关重要.
- 当前TADF材料中不够的RISC率限制了电光发射 (EL) 的效率,运行稳定性和设备寿命.
- 开发加速RISC的策略对于高性能OLED来说至关重要.
研究的目的:
- 设计和合成具有加速RISC速率的新型不对称TADF分子.
- 研究分子不对称性和振动对RISC效率的影响.
- 为了评估这些新的TADF材料在OLED设备中的性能.
主要方法:
- 使用不对称的吸收电子的骨干 (二和/二) 采用了打破对称性的策略.
- 两个新的不对称的TADF分子,4tCzCN-pXT和4tCzCN-pTXT用3,6-di-tert-butylcarbazole捐赠体进行了合成.
- 描述了OLED中的RISC速率,光物理特性和设备性能.
主要成果:
- 不对称的TADF分子表现出显著增强的分子振动,促进更快的内在RISC速率 (高达1.24 × 107 s-1),一个数量级高于对称的控制.
- 使用这些材料制造的OLED实现了高的外部量子效率 (EQE),高达31.2% (无兴奋剂) 和35.8% (兴奋剂) 的最小滚动.
- 当用作多共振发射器的敏化剂时,EQE超过40%,具有特殊的操作稳定性 (LT9024974h在1000cdm-2>).
结论:
- 提出的对称性破坏策略有效地加速了TADF材料中的RISC过程.
- 开发的不对称分子显示出高效和稳定的OLED应用的巨大潜力.
- 这些发现为有机发光二极管技术的发展提供了有希望的途径.
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