Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 829, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154475
Keywords
Sr2GdSbO6:Mn4+; Ti4+- and W6+-substitution; Photoluminescence; Far-red phosphors; Plant cultivation and growth LEDs
Categories
Funding
- Doctoral Research Foundation of Hebei Normal University of Science and Technology [2016YB003]
- 2018 National College Students' innovation and entrepreneurship training project [201810798006]
- Hebei Master's Innovation Subsidy Project in 2019 [CXZZSS2019118]
- National Natural Science Foundation of China [51777138]
- Natural Science Foundation of Tianjin City [18JCZDJC99700, 18JCYBJC87400]
Ask authors/readers for more resources
A novel double perovskite Ti4+ and W6+ modified Sr2GdSbO6(SGSO):Mn4+ far-red phosphor was prepared by traditional solid state reaction method. The samples were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), photoluminescence spectra (PL), decay life, temperature-dependent emission spectra and internal quantum efficiency (IQE). Due to the E-2 ->(4)A(2) transition of Mn4+ ions, the emission band centered at 667 nm was observed in the range of 600-780 nm, which matched the absorption spectra required for plant growth. The excitation spectra consist of four excitation bands, peaking at 276, 305, 358 and 506 nm in the range of 220-600 nm, respectively, which indicates that SGSO:Mn4 + phosphors can be excited by ultraviolet, near-ultraviolet and blue light emitting diode (LED) chips. The optimum doping concentration of Mn4+ is determined to 0.4 mol% and the concentration quenching mechanism is the dipole-quadrupole interaction of Mn4+ activator. The effect of co-doping Ti4+ and W6+ ions on the luminescent properties of SGSO:Mn4+ was studied. The PL intensity of SGSO:0.004Mn(4+), 0.004Ti(4+) and SGSO:0.004Mn(4+), 0.004 W6+ are 1.65 and 2.07 times than that of SGS0:0.004Mn(4+) phosphor. Impressively, all samples possess excellent thermal stability (I-423k/I-298k>70%). The results illustrate that TO + and W (6+) can significantly improve the luminescent properties and thermal stability of SGSO:Mn4 +. Finally, a kind of LED device was fabricated by combining 365 nm ultraviolet LED chip with far-red light emitting SGSO:0.004Mn(4+), 0.004 W6+ phosphors and BaMgl(10)O(12):Eu-2 + blue phosphor. Because the emission band of SGSO:0.004Mn(4+), 0.004 W-6 + matches well with the absorption band of plant pigment PR, under the excitation of near ultraviolet (UV) to blue light, SGSO:0.004Mn(4+), 0.004 W6+ phosphors have potential application prospects in indoor plant cultivation. (C) 2020 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available