Journal
MATERIALS RESEARCH EXPRESS
Volume 6, Issue 11, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ab47c6
Keywords
red-orange phosphors; luminescence properties; thermo stability; concentration quench
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Funding
- Research Fund of Qinghai Normal University [2018zr007]
- Key Research and Development Program of Science and Technology Department of Qinghai Province [2019-SF-124]
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Novel red-orange emitting phosphors Sr9Ga(PO4)(7):xSm(3+) were synthesized by solid state reaction for the first time. Their crystal structure, photoluminescence, thermo stability and lifetime were studied in detail. Results of XRD analysis suggests that Sm3+ is doped on the host lattice without any changes on crystal texture and photoluminescence emission spectra mainly consists of three emission bands attributed to transitions of (4)G(5/2) -> H-6(J) (J = 5/2, 7/2 and 9/2). Besides, the Dexter theory and lifetime were considered carefully to explain the concentration quench performance of phosphors and to reveal the mechanism for Sm3+ energy transfer. Especially, at 150 degrees C the phosphor still kept high energy efficiency relative to 97.34% of the best. Additionally, the thermal activation energy was determined to be 0.411 eV as calculated from the Arrhenius equation. All the results showed the potential application of these red-orange phosphors in n-UV white light-emitting diodes.
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