定位异构体替代 bis ((2-phenylpyridine) ((acetylacetonate) 复合物,用于高效的有机发光二极管,具有扩展的颜色范围
Jia-Xun Xie1,2, Chih-Chien Lee2, Lin-Ming Huang3
1Organic Electronics Research Center, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
ACS applied materials & interfaces
|August 25, 2023
概括
研究人员开发了新的蓝替代的复合物,用于高效的黄色至红色光有机发光二极管 (PhOLED). 这些材料提供了一个简单的设计策略,用于降低分子重量的高性能PhOLED.
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:
- 乙乙二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二
- 开发用于黄色到红色区域的高效发射器仍然是PhOLED技术的一个关键挑战.
研究的目的:
- 为了合成和表征新的蓝替代的Ir(ppy)2(acac) 复合物,用于黄色到红色的发射.
- 研究替代位置对复合物的电子和光物理性质的影响.
- 为了评估这些复合体作为 PhOLED 设备中的发射器的性能.
主要方法:
- 合成了三种定位异构体的替代的Irppy) 2 (acac) 复合体:Ir3-CN,Ir4-CN和Ir10-CN).
- 理论研究和单晶X射线衍射分析.
- 光发光量子收益率 (PLQY) 和光寿命测量.
- 使用合成复合物的 PhOLED 设备的制造和表征.
主要成果:
- 合成的复合物在黄色到红色区域 (544-625 nm) 发射.
- 子替代调整了电子分布和协调键的长度,增强了电荷转移,减少了能量差距.
- 实现了较高的PLQY:83%的Ir(3-CN,54%的Ir(4-CN,75%的Ir(10-CN).
- 具有Ir{3-CN) 的设备显示最大外部量子效率 (EQE) 为25.4%,电流效率为56.9cd A-1 ,功率效率为68.7lm W-1 ,亮度为61,340cd m-2 .
- 观察到卓越的效率稳定性,在高亮度下最小的滚动.
结论:
- 在ppy联体上进行定位的蓝替代是一种有效的策略,用于设计高效的黄色至红色光发射器.
- 开发的复合体提供了一个简单的分子设计,减轻了高性能PhOLED的重量.
- 这些发现为开发下一代显示器和照明应用的先进材料提供了途径.
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