期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 4, 页码 5073-5080出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b19919
关键词
persistent luminescence; interface; energy transfer; color tunable; external stimuli
资金
- NSFC [21672267, 51733010, 51603232, 51873237, 51903254]
- Science and Technology Planning Project of Guangdong [2015B090913003]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2017B030306012]
- Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2017TQ04C782]
- Science and Technology Program of Guangzhou [201804010173]
- China Postdoctoral Science Foundation [2018 M643288]
- Fundamental Research Funds for the Central Universities
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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