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Color tunable single-phase Eu2+ and Ce3+ co-activated Sr2LiAlO4 phosphors
SCI Impact Factor
7.393
Authors
J. Ha, Y. H. Kim, E. Novitskay, M. Sanchez, O. A. Graeve, S. P. Ong, W. B. Im, J. McKittric
Journal
J. Mater. Chem. C
Status
published
Vol
7
Page
7734-7744
Year
2019

High purity Eu2+ and Ce3+ singly and co-activated Sr2LiAlO4 phosphors were successfully synthesized through a facile combustion reaction. Fabrication of color tunable, single-phase phosphors was achieved by varying the Eu2+/Ce3+ ratio that utilized the energy transfer between Ce3+ and Eu2+. For the singly activated compositions, the highest quantum efficiencies were 25% and 40% for Sr1.998Eu0.002LiAlO4 and Sr1.998Ce0.002LiAlO4, respectively. The emission of Sr2LiAlO4:Ce3+ and the excitation of Sr2LiAlO4:Eu2+ overlap in the range of 400 nm–500 nm, so that energy transfer from Ce3+ → Eu2+ takes place. The emission color of Eu2+ and Ce3+ co-activated Sr2LiAlO4 changes from blue, to cool-white, to green depending on the activator concentrations. The maximum quantum efficiency of Eu2+ and Ce3+ co-activated Sr2LiAlO4 was 55%, a 40% increase over the singly activated phosphors, which demonstrates that the quantum efficiency improves by co-activation.