journal article·2020-01-29

Reversible and Continuous Color-Tunable Persistent Luminescence of Metal-Free Organic Materials by “Self”-Interface Energy Transfer

Yingxiao Mu, Bingjia Xu, Zhan Yang, Hanhui Wen, Zhiyong Yang, Sunil Kumar Baburao Mane, Juan Zhao, Yi Zhang, Zhenguo Chi, Ben Zhong Tang

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Abstract

Persistent luminescence from metal-free organic materials is attractive for their ultralong exciton lifetimes. Color-tunable persistent luminescence from single-component organic materials is fascinating but still challenging. By utilizing an efficient approach of "self"-interface energy transfer (IET), the persistent luminescence color of an organic phosphor (CTXO) can be reversibly and continuously tuned by external physical stimuli. Its color circularly changes between green (lifetime = 0.24 s) and deep-yellow (lifetime = 0.10 s) when CTXO is repeatedly triggered with thermal annealing and mechanical grinding. Self-IET from the crystalline part (donor), which exhibits persistent room-temperature phosphorescence, to the amorphous part (acceptor) inside its semicrystal during these treatments is found to be the key exciton process for such novel color modulation. This also provides opportunity for designing stimuli-responsive smart materials with controlled persistent luminescence.
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Research context

OpenAlex topics: Luminescence and Fluorescent Materials · Organic Light-Emitting Diodes Research · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

PCFM Lab, GDHPPC Lab, Guangdong Engineering Technology Research Center for High-Performance Organic and Polymer Photoelectric Functional Films, State Key Laboratory of Optoelectronic Material and Technologies, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China

Instrumental Analysis and Research Center, Sun Yat-Sen University, Guangzhou 510275, China

Department of Chemistry, Institute of Molecular Functional Materials, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, 999077 Hong Kong, China

Funding

Ministry of Education of the People's Republic of China · China Postdoctoral Science Foundation · National Natural Science Foundation of China · Science and Technology Program of Guangzhou · Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program · Guangdong Natural Science Funds for Distinguished Young Scholar · Science and Technology Planning Project of Guangdong

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