Xu Yicheng, Abulipizi Gulizhabaier, Wang Yuxin, Fang Yanlun, Yu Zimin, Zhou Juanjuan, Li Zhanjun
Key Laboratory of Biological Targeting Diagnosis, Therapy and Rehabilitation of Guangdong Higher Education Institutes, The Fifth Affiliated Hospital, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong 511436, PR China.
School of Health, Guangzhou Vocational University of Science and Technology, Guangzhou, Guangdong 510080, PR China.
ACS Appl Mater Interfaces. 2024 Oct 16;16(41):55823-55831. doi: 10.1021/acsami.4c13865. Epub 2024 Oct 5.
Near-infrared (NIR) persistent luminescence (PersL) materials have unique optical properties with promising applications in bioimaging and anticounterfeiting. However, their development is currently hindered by poor red-light-exciting ability. In this study, CaTiO:Cr,Y (CTCY) was synthesized with 650 nm-excited 772 nm NIR PersL. The Y doping in the Ca lattice plays a key role in the PersL property. A charge compensation mechanism was proposed, in which Cr in the Ti lattice was stabilized by Y-doping while oxygen vacancies were generated to store the excitation energy at the same time. A thermal ionization mechanism might elucidate the red-light-excited NIR PersL of CTCY, which benefits from the perovskite structure of CaTiO. CTCY has 120 times more intense red-light-excited PersL than ZnGaGeO:Cr. Its potential applications in luminescence anticounterfeiting and bioimaging were demonstrated using a visible/NIR dual-channel PersL flower painting and a CTCY-labeled bone screw for in situ reactivable PersL imaging using red light illumination instead of X-ray, respectively. This study not only provides a new NIR PersL material but also will add to our understanding in developing other potential red-light- or even NIR-activable PersL materials with perovskite-like structures.
近红外（NIR）持续发光（PersL）材料具有独特的光学性质，在生物成像和防伪领域有着广阔的应用前景。然而，目前其发展受到红光激发能力差的阻碍。在本研究中，合成了CaTiO:Cr,Y（CTCY），其在650 nm激发下具有772 nm的近红外持续发光。Ca晶格中的Y掺杂对持续发光性能起着关键作用。提出了一种电荷补偿机制，其中Ti晶格中的Cr通过Y掺杂得以稳定，同时产生氧空位以存储激发能。热电离机制可能解释了CTCY的红光激发近红外持续发光，这得益于CaTiO的钙钛矿结构。CTCY的红光激发持续发光强度比ZnGaGeO:Cr高120倍。分别使用可见/近红外双通道持续发光花卉画作和CTCY标记的骨螺钉展示了其在发光防伪和生物成像中的潜在应用，前者用于原位可再激活的持续发光成像，后者使用红光照明而非X射线。本研究不仅提供了一种新的近红外持续发光材料，还将增进我们对开发其他具有钙钛矿结构的潜在红光或甚至近红外可激活持续发光材料的理解。
