Yan Yu, Liu Chengfang, Fan Jianzhong, Li Yusheng, Liu Huanling, Wang Qian, Li Xiangchun, Li Junfeng, Lai Wen-Yong
State Key Laboratory of Organic Electronics and Information Displays (SKLOEID), Institute of Advanced Materials (IAM), School of Chemistry and Life Sciences, Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China.
Research (Wash D C). 2023 Sep 28;6:0241. doi: 10.34133/research.0241. eCollection 2023.
Achieving color-tunable emission in single-component organic emitters with multistage stimuli-responsiveness is of vital significance for intelligent optoelectronic applications, but remains enormously challenging. Herein, we present an unprecedented example of a color-tunable single-component smart organic emitter (DDOP) that simultaneously exhibits multistage stimuli-responsiveness and multimode emissions. DDOP based on a highly twisted amide-bridged donor-acceptor-donor structure has been found to facilitate intersystem crossing, form multimode emissions, and generate multiple emissive species with multistage stimuli-responsiveness. DDOP pristine crystalline powders exhibit abnormal excitation-dependent emissions from a monomer-dominated blue emission centered at 470 nm to a dimer-dominated yellow emission centered at 550 nm through decreasing the ultraviolet (UV) excitation wavelengths, whereas DDOP single crystals show a wide emission band with a main emission peak at 585 nm when excited at different wavelengths. The emission behaviors of pristine crystalline powders and single crystals are different, demonstrating emission features that are closely related to the aggregation states. The work has developed color-tunable single-component organic emitters with simultaneous multistage stimuli-responsiveness and multimode emissions, which is vital for expanding intelligent optoelectronic applications, including multilevel information encryption, multicolor emissive patterns, and visual monitoring of UV wavelengths
在具有多级刺激响应性的单组分有机发光体中实现颜色可调发射对于智能光电应用至关重要，但仍然极具挑战性。在此，我们展示了一个前所未有的颜色可调单组分智能有机发光体（DDOP）的例子，它同时展现出多级刺激响应性和多模式发射。基于高度扭曲的酰胺桥连供体-受体-供体结构的DDOP已被发现有助于系间窜越，形成多模式发射，并产生具有多级刺激响应性的多种发射物种。DDOP原始结晶粉末通过降低紫外（UV）激发波长，呈现出异常的激发依赖性发射，从以470 nm为中心的单体主导的蓝色发射到以550 nm为中心的二聚体主导的黄色发射，而DDOP单晶在不同波长激发时显示出一个宽发射带，主峰发射峰在585 nm。原始结晶粉末和单晶的发射行为不同，表明发射特征与聚集状态密切相关。这项工作开发了具有同时多级刺激响应性和多模式发射的颜色可调单组分有机发光体，这对于扩展智能光电应用至关重要，包括多级信息加密、多色发射图案以及紫外波长的视觉监测。
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