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向深蓝色热激活延迟光发射器改造宏循环供体结构

Chen-Han Lu¹, Chun-Yen Lin², Shi-Xian Zeng²

¹Department of Electrical Engineering, Graduate Institute of Electronics Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan.

ACS applied materials & interfaces

|July 17, 2023

概括

新的分子工程策略已经为有机发光二极管 (OLED) 产生了高效的深蓝色热激活延迟光 (TADF) 分子. 这些分子具有高性能,为先进的显示应用铺平了道路.

科学领域:

材料科学材料科学材料科学
有机电子有机电子
光物理学的光学物理学

背景情况:

深蓝色热激活延迟光 (TADF) 发射器对于高性能有机发光二极管 (OLED) 来说至关重要,特别是在显示应用中.
开发高效的深蓝色TADF分子需要精确的捐赠-接受系统的分子工程.

研究的目的:

报告一种高效的分子工程方法,通过修改D-π-A配置系统中的捐赠/接受特征来开发深蓝色TADF分子.
通过将氧和硫桥单元引入宏循环供体,合成和描述新的TADF发射物.
建立一个清晰的结构-属性-性能关系,以指导高效深蓝色TADF发射器的设计.

主要方法:

合成和描述新型的TADF分子 (c-ON-MeTRZ,c-NS-MeTRZ,c-NN-MePym) 与修饰的宏循环捐赠体.
光物理特征包括光发光量子产量 (PLQYs) 和TADF属性的分析.
使用不同主机 (mCPCN,DPEPO) 的合成发射器制造深蓝色TADF OLED设备的制造和测试,以评估外部量子效率 (EQE) 和国际照明委员会 (CIE) 坐标.

主要成果:

合成了两种新的深蓝色TADF发射器,c-ON-MeTRZ和c-NS-MeTRZ,与模型分子相比显示蓝色转移的发射和高的PLQY.
结合c-ON-MeTRZ的OLED设备实现了30.2%的最大EQE (CIE:0.14,0.13),在极地主机 (DPEPO) 中改善到34.4%.
使用c-NS-MeTRZ的设备实现了最大EQE15.4% (CIE:0.14,0.09),提高到DPEPO的29.3%,归因于稳定的电荷传输状态和减少的能量差距.

结论:

分子设计策略有效调节宏循环供体特征,以获得高效的深蓝色TADF发射器.
高水平二极管比率 (85-89%) 有助于在制造的OLED中提高光外合效率.
该研究建立了一个全面的结构-属性-性能关系,验证了先进的OLED应用程序的分子设计方法.

关键词:

深蓝色的发射器发射器发射二极管的导向.一个宏观循环的捐赠者.有机发光二极管有机发光二极管热激活的延迟光效应

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