发光
材料科学
磷光
持续发光
荧光粉
光电子学
激子
退火(玻璃)
能量转移
无定形固体
光化学
光学
化学物理
荧光
化学
物理
热释光
复合材料
有机化学
量子力学
作者
Yingxiao Mu,Bingjia Xu,Zhan Yang,Huang Wen,Zhiyong Yang,Sunil Kumar Baburao Mane,Juan Zhao,Yi Zhang,Zhenguo Chi,Ben Zhong Tang
标识
DOI:10.1021/acsami.9b19919
摘要
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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