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Erschienen in:
08.04.2019
Energy transfer and luminescence properties of a green-to-red color tunable phosphor Sr8MgY(PO4)7:Tb3+,Eu3+
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 10/2019
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Abstract
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.