Abstract
A novel white emitting phosphate-based phosphor Ca3-xLix(PO4)2-x(SO4)x:Dy3+, Sm3+ with high emission intensity and lower correlated color temperature were successfully synthesized via the sol-gel method.The structures of these prepared phosphors matched well with standard Ca3(PO4)2. The Dy3+-doped Ca3-xLix(PO4)2-x(SO4)x phosphors showed white luminescence via the combination of blue (487 nm) and yellow (578 nm) emissions, which were attributed to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 electron transitions of Dy3+, respectively. The synthesized phosphor exhibited a significant enhancement in luminescence intensity at the optimum value of x = 0.15. With the incorporation of Sm3+, a warm white emission with lower correlated color temperature (4281 K) was achieved in Dy3+/Sm3+ co-doped samples. The obtained external quantum efficiency reached 21.7% in the optimized phosphor. The improved performance was strongly associated with red emission supplemented by Sm3+, and it demonstrated the existence of efficient energy transfer between the Dy3+ and Sm3+ ions (4F9/2 → 4G7/2 and 4F9/2 → 4G5/2). Overall, the investigation carried out by us has revealed that the luminescence properties of Ca3(PO4)2 phosphor can be significantly improved through Li+/S6+ partial substitution and Dy3+/Sm3+ co-doping.
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