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High-efficiency energy transfer in the strong orange-red-emitting phosphor CeO:Sm, Eu. | LitMetric
High-efficiency energy transfer (ET) from Sm to Eu leads to dominant red emission in Sm, Eu co-doped single-phase cubic CeO phosphors. In this work, a series of Sm singly and Sm/Eu co-doped CeO cubic phosphors was successfully synthesized by solution combustion followed by heat treatment at 800 °C in air. The crystal structure, morphology, chemical element composition, and luminescence properties of the obtained phosphors were investigated using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and photoluminescence analysis. Under 360 nm excitation, the Sm singly doped CeO phosphor emitted strong yellow-red light at 573 nm (G-H) and 615 nm (G-H). Meanwhile, the CeO:Sm, Eu phosphors showed the emission characteristic of both Sm and Eu, with the highest emission intensity at 631 nm. The emission intensity of Sm decreased with increasing Eu content, suggesting the ET from Sm to Eu in the CeO:Sm, Eu phosphors. The decay kinetics of the G-H transition of Sm in the CeO:Sm, Eu phosphors were investigated, confirming the high-efficiency ET from Sm to Eu (reached 84%). The critical distance of energy transfer ( = 13.7 Å) and the Dexter theory analysis confirmed the ET mechanism corresponding to the quadrupole-quadrupole interaction. These results indicate that the high-efficiency ET from Sm to Eu in CeO:Sm, Eu phosphors is an excellent strategy to improve the emission efficiency of Eu.
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