有机发光二极管的高效和稳定的热激活延迟光拉 (II) 复合物
Jian-Gong Yang1, Xingyu Feng1, Nengquan Li1
1Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, P. R. China.
Science advances
|June 14, 2023
概括
新的 () 复合物使有机发光二极管 (OLED) 能够高效稳定,而不需要依赖昂贵的第三排金属. 这些热激活延迟光 (TADF) 材料提供高性能和长寿命.
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:
- 热激活延迟光 (TADF) 材料对于高效的有机发光二极管 (OLED) 来说至关重要.
- 使用地球丰富的过渡金属开发的TADF复合物相比于第三排金属的开发研究较少.
- 金属乱的内电荷转移 (MITC) 状态为新型TADF机制提供了潜在的途径.
研究的目的:
- 为OLED应用设计和合成新的TADF (II) 复合物.
- 调查这些Pd (II) 复合物的光物理性质和运行稳定性.
- 为高效和强大的OLED发射器展示第三排过渡金属的替代品.
主要方法:
- 合成和表征Pd(II) 复合物与量身定制的连接体.
- 瞬态光谱学和理论计算,以了解激发状态的动态.
- 采用已开发的Pd (II) 复合体的OLED设备的制造和测试.
主要成果:
- 开发了两种具有高效率 (82-89%) 和短寿命 (0.97-2.19μs) 的色和红色发射TADF Pd(II) 综合体.
- 证明了金属振式快速系统间交叉作为这些复合体中TADF的关键机制.
- 在OLED中实现了高的外部量子效率 (27.5-31.4%),具有最小的滚动和特殊的操作稳定性 (>220小时在1000cdm-2).
结论:
- 具有MITC状态的Pd(II) 综合体为TADF发射器提供了高效和强大的替代方案.
- 强大的s-捐赠配体和非共价相互作用有助于增强稳定性.
- 这种方法为开发具有成本效益和高性能的OLED使用地球上丰富的金属打开了道路.
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