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开发红色和近红外延迟光发射在替代的捐助者-接受者多环碳化合物OLED发射器:一个理论研究

Smruti Ranjan Sahoo^1,2, Glib V Baryshnikov², Hans Ågren¹

¹Division of X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden.

The journal of physical chemistry. A

|February 26, 2025

概括

在多环芳 (PAH) 中的替代使有机发光二极管 (OLED) 能够有效地进行红色和近红外 (NIR) 热激活延迟光 (TADF). 这项研究设计了用于先进的OLED应用的具有增强光物理学的新型DA化合物.

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:

替代在有机发光二极管 (OLED) 材料中显著影响热激活延迟光 (TADF).
用替代的多环芳 (PAH) 是开发高效TADF发射器的关键组成部分.

研究的目的:

探索在化环PAH中对称替代的分子设计策略,特别是二[a,c]皮 (DBP).
研究新型捐赠体-接受体 (D-A) 化合物的结构-性质关系,其中包括二甲基碳醇 (DMCz) 和二甲基二胺 (DMDPA) 捐赠体.
通过向分子设计实现红色和近红外 (NIR) TADF发射.

主要方法:

基于DBP框架的DA化合物的计算分子设计.
理论研究分子结构,光物理和电子特性.
单元-三元能量分裂 (ΔE_ST) 和旋转轨道合 (SOC) 的计算.

主要成果:

设计的D-A型PAH排放器呈现红色和NIR TADF排放.
替代稳定了LUMO,减少了HOMO-LUMO差距,并且与非替代类型相比显著降低了DE_ST.
骨关联D-A化合物显示较小的DE_ST和更高的反向交叉系统 (RISC) 率 (高达1 × 10^6 s^-1),从而实现高效的延迟光.

结论:

基于DBP的PAH中的对称替代提供了一个可行的途径,以实现高效的红色和NIR TADF发射器.
设计的化合物,特别是那些含有较高含量和正形连接的化合物,在OLED应用中显示出有前途的光物理特性.
预测的发射波长范围从670nm到1200nm以上,突出了多种光电子应用的潜力.

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