Journal
RSC ADVANCES
Volume 8, Issue 26, Pages 14164-14170Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra01689e
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Funding
- Qinghai Provincial Natural Science Foundation for Young Scholars [2017-ZJ-929Q]
- Qinghai Provincial Innovation Platform Program [2017-ZJ-Y17]
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Ca9La1-x(PO4)(7):xSm(3+) phosphors (0.01 < x < 0.25) were synthesized via high temperature solid-state reaction. Their properties including crystal structure, decay performance, thermal stability and photoluminescence were examined in detail. Phase analysis indicated that the phosphors crystallized in a rhombohedral structure, and the emission spectra of the phosphors consisted of four peaks centered around 570, 607, 653, and 714 nm, attributed to Sm3+ ions transitions (4)G(5/2) H-6(J) (J = 5/2, 7/2, 9/2, and 11/2, respectively). The optimal Sm3+ doping content was 0.12 mol and the Ca9La(PO4)(7):Sm3+ phosphor also exhibited better thermal stability compared to other phosphors. In addition, the mechanism behind the energy transfer between Sm3+ ions was determined to be dipole-dipole interactions as described by Dexter theory. The results indicated that as orange-red phosphors, Ca9La (PO4)(7):Sm3+ phosphors were promising candidates for being integrated into white light emitting diodes.
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