Abstract
For the first time, a hierarchical phosphor Y2O3:Eu3+/MCM-41/YVO4:Eu3+, with a core–shell-core heterostructure, is presented in this study. Synergistically bridging the phosphors Y2O3:Eu3+ (as an inner core) and YVO4:Eu3+ (as an outer core) by amorphous SiO2, i.e., MCM-41 (with ordered mesoporous channels) leads to the generation of the core–shell-core heterostructure with enhanced red emission and tunable, broadened-band response to excitation. The novel structure of the core–shell-core hierarchical material is clarified through various characterization methods including X-ray diffraction analysis, transmission electron microscopy, selected-area electron diffraction and N2 adsorption–desorption measurements. Significantly, through temperature-dependent fluorescence investigation, it is found that our core–shell phosphor (Y2O3:Eu3+/MCM-41) exhibits impressive fluorescence stability against temperature variation (27–227 °C) due to the protective effect resulting from MCM-41. By contrast, lowered stability can be noted for the core–shell-core phosphor (Y2O3:Eu3+/MCM-41/YVO4:Eu3+), especially when the temperature is higher than 100 °C, owing to the outer core (YVO4:Eu3+ nanoparticles) that is directly exposed to heat. Such a kind of luminescent materials holds substantial promise for labeling the organisms that are vulnerable to short-wavelength UV light irradiation. Additionally, potential intelligent systems can be expected to be designed on the basis of the fluorescence mutation as triggered by the temperature of 100 °C.
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Acknowledgements
We greatly appreciate the Construction Project from Guangdong Engineering Technique Research Center (506302679076), High-Level Talent Start-Up Research Project of Foshan University (Gg040918), Start-Up Research Project of Foshan University (gg040948), Universities of Guangdong Province (2016GCZX008), the Project Funded by Engineering Technology Center of Foshan City (2014GA000355), and the Key Platform Financing Programs from the Education Department of Guangdong Province (gg041002).
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Chang, M., Hu, H., Zhang, Y. et al. Core-shell-core heterostructural engineering of Y2O3:Eu3+/MCM-41/YVO4:Eu3+ for enhanced red emission and tunable, broadened-band response to excitation. J Mater Sci: Mater Electron 28, 16026–16035 (2017). https://doi.org/10.1007/s10854-017-7502-5
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DOI: https://doi.org/10.1007/s10854-017-7502-5