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Title: Core-shell-core heterostructural engineering of Y2O3:Eu3+/MCM-41/YVO4:Eu3+ for enhanced red emission and tunable, broadened-band response to excitation
Authors: Chang, ML
Hu, HW
Zhang, YY
Chen, DC
Hu, H 
Ye, XF
Chen, M
Issue Date: 2017
Publisher: Springer
Source: Journal of materials science : materials in electronics, 2017, v. 28, no. 21, p. 16026-16035 How to cite?
Journal: Journal of materials science : materials in electronics 
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 N-2 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 A degrees 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 A degrees 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 A degrees C.
ISSN: 0957-4522
EISSN: 1573-482X
DOI: 10.1007/s10854-017-7502-5
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