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基于TADF的有机LED的效率推移的优点

S Diesing^1,2, L Zhang^1,2, E Zysman-Colman³

¹Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK.

|March 28, 2024

概括

研究人员开发了一种改进热激活延迟光 (TADF) 有机发光二极管 (OLED) 的新指标. 这一优点数字解决了效率的下降,提高了OLED显示器和高亮度应用的性能.

科学领域:

材料科学
有机电子
光物理学

背景情况:

有机发光二极管 (OLED) 是手机和电视中的商业显示技术.
热激活延迟光 (TADF) 材料是通过采集三重激子来有效发光的无重金属替代品.
当前的TADF OLED在较高的驱动电流下出现显著的效率下降.

研究的目的:

分析TADF OLED效率下降的原因.
为设计TADF材料提出一个新的优点,以尽量减少效率的下降.
引导TADF OLED的开发,以提高在工作条件和高亮度应用中的性能.

主要方法:

对多种TADFOLED的效率推移进行分析.
在TADF材料中研究单质和三质激子之间的动态平衡.
在这种平衡基础上开发和验证一种新的价值观.

主要成果:

现有的参数,如小单元-三元能量差 (ΔE_ST) 和高反向系统交叉率 (k_RISC) 不能完全解释效率的推移.
考虑激子的动态平衡,提出了一个新的优点.
拟议的优点数字显示与报告的TADF OLED数据的相关性,并提供了减少效率滚动的途径.

结论:

在TADF OLED中,效率滚动不仅仅由ΔE_ST或k_RISC来决定.
新提出的优点数字为设计TADF材料提供了更全面的方法.
这项工作将有助于开发高效的TADF OLED显示器,照明,增强现实和激光.

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