X-ray excited luminescence (XEL) of scintillators is significant for imaging applications in the fields of medical detection, information retrieval, and scientific research. In this case, lanthanide-doped rare-earth nanophosphors show potential as next-generation scintillators owing to their facile synthesis, high chemical stability and photostability, and adjustable XEL emission. In this study, a new type of XEL-enhanced NaLuF4-based nanophosphor was synthesized by doping Tb3+ to sensitize the emission of Eu3+, facilitating the application of the as-prepared nanoscintillators for X-ray imaging on opaque samples and biological specimens. NaLuF4:Gd/Tb/Eu with 5% Tb-doping showed the highest XEL intensity owing to the energy transfer process between Tb3+ and Eu3+. The NaLuF4:Gd/Tb/Eu (10/5/15 mol%) nanoparticles exhibited an excellent scintillation performance with a high light yield of 15 313 photons MeV−1 and low detection limit of 84.1 nGyair s−1. The X-ray imaging test using the NaLuF4:Gd/Tb/Eu (10/5/15 mol%)-based scintillation film exhibited a high spatial resolution of 8.7 lp mm−1. Furthermore, the NaLuF4:Gd/Tb/Eu (10/5/15 mol%)-based scintillation film was applied in X-ray imaging with high contrast for a spring sealed in a capsule and a crab.
Multianalyte detection and analogue discrimination are extremely valuable frontier areas for their wide applications in environmental, medical, clinical and industrial analyses. Nowadays, researchers rack their brains on how to develop excellent multianalyte chemosensors that have presented huge challenges in designing high-efficient fluorescent sensing materials and constructing high-throughput detection methods. In this paper, we propose a novel strategy to utilize the dual-emission fluorescent detection platform as a lab-on-a-molecule, arising from the disalicylaldehyde-coordinated hybrid H 2 Q j3 /Tb based terbium sensibilization coupled excited-state intramolecular proton transfer effects. Using the statistical analysis (PCA and HCA) for sensing signals of three fluorescence channels (431, 543 and 583 nm), we demonstrate this elaborate chemosensor with multianalyte detection of three species (solvents, anions and cations) and pattern discrimination of analogues. As a result, the H 2 Q j3 /Tb shows great lab-on-a-molecule characters for each set of species, resulting in the easier identification of many critical analytes (e.g., H 2 O, NO 2 − and Fe 3+ ) and discrimination of analogues. In addition, it is also proven to be able to provide reliable content determination for an analyte, especially the NO 2 − (LOD = 0.37 μM), and discrimination for mixed analogues. A combination of easy-to-implement preparation procedure and data analysis technique makes this work promising for not only designing similar lanthanide-based materials but also realizing more high-efficient multianalyte sensing systems towards various potential applications.
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