Abstract
A series of Eu2+ ion doped Ca8.96Al1-xGdx(PO4)7:0.04Eu2+ phosphors were synthesized based on the crystal lattice engineering method, and the multi-color tunable luminescence of Eu2+ ions at different sites could be realized only by the change of Gd3+ concentration. This technique not only helps to improve the security level of encrypted information but also provides a new anti-counterfeiting strategy for fluorescence anti-counterfeiting. Furthermore, when Gd3+ ions are introduced, on the one side, lattice expansion induce an increase in cell parameters, on the other hand, results in the redistribution of Eu2+ in the Ca1, Ca2 and Ca3 cation sites. Under the combined action of the centroid shift effect and crystal field effect, Eu2+ ion emission peak shows a trend of first blue shift and then red shift with increase of Gd3+ concentration, and further confirms that when x is below 0.4, Eu2+ ions migrate from the Ca1 and Ca2 sites to the Ca3 sites. On the Contrary, when x exceeds 0.4, it promotes the migration of Eu2+ from Ca2 and Ca3 sites to Ca1 sites.
Published Version
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