Energy transfer and luminescence properties of a green-to-red color tunable phosphor Sr8MgY(PO4)7:Tb3+,Eu3+
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SMYPO:Tb3+, SMYPO:Eu3+ and new single-phased color tunable SMTPO:Eu3+ phosphors were prepared via solid-state method. The phase purity was detected by powder X-ray diffraction. The luminescence properties, decay curves and thermal stability were measured and studied in detail. Excited by the UV light, SMYPO:Tb3+ and SMYPO:Eu3+ display bright green and red emission, respectively; SMYPO:Tb3+,Eu3+ exhibits not only red emission of Eu3+ but also green emission of Tb3+, ascribing to 5D0–7FJ transitions of Eu3+ and 5D3–7FJ and 5D4–7FJ transitions of Tb3+, respectively. The emission color of SMTPO:Eu3+ will be changed from green via yellow and orange to red, by modulating the ratio of Tb3+ to Eu3+. It is proved that Tb3+ can efficiently sensitize the photoluminescence of Eu3+ under UV excitation, owing to the effective energy transfer. The energy transfer efficiency (ηTb → Eu) strongly depends on the Eu3+ concentration, and the maximum ηTb → Eu is up to about 54.2%. Meanwhile, the thermal stability of SMTPO:Eu3+ is excellent.
The research is financially supported by the National Natural Science Foundation of China (Grant Nos. 51802137, 51701091), and the Research Fund for the Doctoral Program of Liaocheng University (Grant No. 318051732).