Ultraviolet (UV) emitting persistent luminescence (PersL) materials have aroused significant interest, owing to their unique self-illuminating high-photo-energy feature under excitation-free conditions. In particular, the advent of X-rays as a charging source for UV PersL has facilitated the control of PersL properties and triggered a breakthrough in possible applications such as X-ray imaging techniques, phototherapy, photocatalysis, and optical information storage. Here, we present novel PersL materials that exhibit ultra-long UV emission for over 2000 h, as detected with a spectrometer. Experimental characterization revealed that the intrinsic oxygen vacancies associated with the local structure of the perovskite LaGaO3 can function as traps, which have super capabilities in energy collection and storage triggered by X-ray irradiation. Notably, this design concept is guided by utilizing an oxygen-defect perovskite as a host, which can serve as powerful guidance for expediting the discovery of new PersL materials. Moreover, due to excellent UV PersL performances, the proposed photodynamic therapy (PDT) platform LaGaO3:Bi,Sb@g-C3N4 demonstrates excellent PDT efficiency in vivo using low-dose X-ray irradiation. Our discovery of this UV PersL material is expected to provide directional solutions and novel perspectives for the development and application of UV luminescence technology.
Bo-Mei Liu,Rui Zou,Sun-Qi Lou,Yi-Fan Gao,Li Ma,Ka-Leung Wong,Jing Wang
X-ray-stimulated near-infrared persistent luminescence nanoparticles (NIR-PLNPs) offer attractive capabilities for autofluorescence free deep-seated imaging and depth-independent treatment, but still suffer from adverse effects caused by high-dose X-ray irradiation (>5 Gy). From the viewpoint of two centers of NIR-PLNPs, i.e., X-ray photon absorption center and defects center, we here propose a top-down composition design strategy for the development of low dose X-ray-stimulated NIR-PLNPs with improved X-ray photon absorption efficiency and optimized persistent luminescence (PersL) performance. Successfully, hypersensitive X-ray-stimulated NIR-PLNPs LaGaO 3 :Sb 3+ ,Cr 3+ with a super-long PersL emission (>500 h) at ∼750 nm are prepared. The nature of high Z atomic constituents of the host LaGaO 3 endows these NIR-PLNPs with strong X-ray absorption capacity. Simply by codoping with size-mismatched ions Sb 3+ , the concentration of oxygen vacancies in the host is rationally optimized, leading to the enhanced NIR PersL performance of Cr 3+ ions. In vivo bioimaging demonstrates that the designed X-ray-stimulated NIR-PLNPs LaGaO 3 :Sb 3+ ,Cr 3+ can be readily reactivated under X-ray irradiation with even a lower dose to 0.37 Gy, showing the advantages of these nanoparticles on deep-seated imaging and treatment. More importantly, we anticipate that our proposed top-down composition design strategy can be applied to develop much low dose X-ray-stimulated NIR-PLNPs in the future.
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